this depends on what you are wanting to fit back in.if the bb is a standard fitment for other modells it is as simple as making sure all the suspension and breake components are equivelant or better that the standard car with the new bb motor size. then is a simple mod plate which most decent certified mechanical engineer can do.if it is someting differnet then its a whole diifferent ball game.with all of this said my advise is to talk to the engineer who will certify the conversion they will tell you exacty what they is needed.Cheers
There is a guy called John Cain in Brisbane. I used him a few years ago now when I put a 302W in my XP Coupe, and was very happy. Specialises in engine Mods. He does most blue plate mods. I will see if I can dig up his number.DAve