Need to make a decision fast 5.7/6.1/340

It depends on what you start with as far as which Gen III. An old truck 5.7 is gonna need more massaging get 450-500hp than a 6.1. Find some Eagle heads and get them cnc'd and swap to some "good" pistons as well as a .600 lift cam with 230-240 @.050 and things get real nasty power wise in the Gen III world. Also jrlegacy dont leave out the part that you're using a HemiDenny K member no? That changes things with the manifolds I think.