sorry to put it this way and please dont take offence but if you have to ask you dont have the skills base to do it
hope you have lots of spare cash because you are going to end up buying some mechanic a new home and putting his 3 kids through collage
that said
the gt axle will only live with about 200bhp so you need to look around for something that will live with double that and is narrow, im using a jaguar rear end that will take that sort of power ,looks good and can be narrowed if you want to keep the width the same (it does add a bit to the rear hight but only about 2" max ) you can go compleat custom with 5 link and something like a narrowed 9" ford axle
the body will not live with that much torque and will need to be stiffened
the engine bay would need to be stripped and a tube custom front end made to get that engine in
dont get a billet bell housing as you will need the vette box as well
apart from that good luck and let us know how you get on