I needed to know if the 4.9 would bolt in place of the 4.1. It's a 86 Deville FWD. Also, could the 4.9 handle a turbo install. Not talking racing stuff here, Just some extra power on the top-end side. Maybe an extra 100 HP or so. I have heard both side's of the HT4100 history, And being that I'm not going to get rid of my baby and it being a FWD I dont want to try and do a out of family engine swap. I'v had good luck with the HT4100s so far and I dont baby my cars. Thanks for any help people.