LS4 is the front pulley you want
Thats the V8 from the FWD cars. So its the shortest. You might be able to use a crank from an LS4 in just about any LS no machining required... but don't quote me there.
Gonna make your own engine cradle or buy a pre-fab one?
My buddy has a TB SS with a 6.0 in it. He went with a 216/218 cam... can't recall the lift, but it cranks out the power. Not much chop.
What heads are you gonna run? That should help you make your decision on what cam to get.
https://www.youtube.com/watch?v=JPAeepqrY-0
^^^^ the "Walter White" of cams for your entertainment.
YUS, more Chevy peoples