I'm guessing the Fox kits won't work as the Fox exhaust manifolds hit the shocktowers big time. Turbo kits are pretty much car-specific to use the available room in that particular car, and take advantage of whatever they can. Most people use a 5.0 EFI system when turbo'ing these cars BTW. There's a guy at another board I frequent that has a 66fb with a twin-turboed EFI'ed 331 & Viper 6spd. ~550rwHP & 24mpg 