And to think.....I was an English teacher. Had to edit muh lett'rin.
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Performance Concepts
1259 NW Broad St, Murfreesboro, TN 37129
Phone: (615) 890-9755
Owner: Eddie Carlisle
Well, went to talk to him today and I gotta say that this guy is the second coolest shop guy I have ever talked to in the USA!

The other was Bill MacDowell, owner of Wild Bill's Electronics in Boaz, Alabama. I'll post up what he told me and if anyone wants to verify it, they are free to visit a local shop of their own. Might be a good idea as I am not a mechanic and you might get a better price.
So,
When I popped the idea to him, Eddie never blinked his eyes and said matter of factly and instantly that it could "easily" be done - that is, easily for a fabricator with years of racing experience. He thought the idea was really cool and in fact, there are a lot of "pro stock" racers doing exactly what I am thinking about for the Allante. And, not entirely the same thing, but the shop has a late '70s Malibu that is getting tubbed so they are doing the same thing for that car that they would have to do to an Allante...or even a mid-90s Eldorado. He said making a FWD car into RWD was more common than some people realize...people outside the racing world.
Eddie is more into drag racing and the shop car has a turbocharged Camaro putting down over 600hp. I liked the idea that he was very familar with what I was wanting to do and he has seen it/done it before with other cars for racing. That it why he first suggested a Ford 9" rear and that it would be an easy job as they fab this rear for several draggers who come in. I mentioned the Vette IRS and he said that for street driving that it would be even better. Plus, C4 Vettes are plentiful and some should be able to be found in a junk yard. Need the front engine cradle to be customized for the Northstar and the IRS can easily be cut out. One went on EBAY for less than $600 just today!
He did ask why I wanted the Northstar and I said the keep the Caddy theme going. The T-56 Tremec will need its bellhousing modified, but he said he was familar with that (from streetrodders) and that it was no problem. He did warn about the cost of repairing a North* as compared to an LS1 pluss the cheaper cost and more power of the Chevy engine. I see his point but I'd rather go Caddy for the engine. I didn't take pics of the Malibu's custom rear and now I wish I had.
When it came to price, he said it depends on sourcing the parts from a salvage yard (I got that part covered) as that's a cost he cannot control. But, he said that he could easily see it being done for $5000, but that he wanted to give himself some room so he quoted $5000-$8000. I asked him worse case scenario what the cost would be. He said he didn't know because so many things happen in a swap, but mentioned that he could not see EVERYTHING costing over $10,000+cost of the donor car. I would like to get an estimate in writing, but for such a project, I don't think that any shop would.
I then asked him a time frame and mentioned 2months. He said he could definitely finish it all in 3months. He does a good business and his workers seemed hard at it especially getting a truck ready in time for a show. There is a car show every Friday night at the Stones River Mall in Murfreesboro (in the back) and he left to take his Camaro to the show. I left the show before he got there though.
So, if anyone wants to call Eddie at Performance Concepts in Murfreesboro I posted the number and address. I can give directions and its easy to get to. Its on US Highway41 that parallels I-24 from Nashville to Chattanooga and across from HOOTERS!. I was hoping that having so many drag racing/NASCAR-BUSCH shops in the area would come in handy with this project and so it seems all can work out.
Eddie said to come in once I got a car and we could work out all the details from engine mounts, to installing the tranny through the floorboard, if a custom welded tunnel would be needed, moving the gas tank, cutting out the spare tire well, and other odds and ends. In the end though, he thought the idea was really cool and didn't see why Allante owners would get so pissy and insist that it couldn't be done. He has been fabbing and racing for years so once he gets the geometry down (I kept saying "measurements" but I learned its more correct to say geometry), its just a matter of cutting and welding.
Hope this info proves useful.