Due to the smaller valve size would the 425 be a good candidate for turbo?

If so.... How many lbs? Better pistons?

Do I have to lose my a/c compressor to upgrade intake?http://www.cadillacforums.com/forums/images/smilies/fryingpan.gif

From what I've heard, a 472/500 intake is a slight upgrade for a 425. There are people that sell them ported. If you go to an aluminum one like a bulldog or an edelbrock I don't think the long a/c compressor will work. They are 3" taller. MTS sells brackets for a/c compressors specifically for that. I'm not sure which compressor you have to use though.

after reading up on this engine i've decided to junk it. These are great for keeping the car from flying away in a tornado that's about it!!!!

Junk the car or the motor? Keep the car (if it's worth it) and put a 472 or 500 in it!

I'm just gonna give it all to my brother. That's pretty much the same thing as junking it. I got a new another Allante so i'm going waste all my money on it instead.

Lol. I got a brother like that too. He either blows motors or runs into trees.