if you want performance go with a none efi engine a friend of mine tryed to hotrod a late model 460 truck engine it was a nightmare and it never ran any better than a 302 he had in the truck before that. go with a early block 1968-1977. i have a 69 ford galaxie which i bought new with 429/4-speed i put a can-am block (494) in it. if you check the internet you will find several people that offer a 814 cubic inch big block if you want to go nuts.