I've only seen stroker kits with chevy rod journals that didn't need the block clearanced, all the rest have needed it but there is always a chance you don't need to. As for heads that just depends on how much you want to spend. Edelbrocks are the cheapest because they are assembled and don't need different headers, rocker arms or manifolds. I like the W2s or large port commandos but the price is alot more if your not starting from scratch. You can get a rotating assembly from just about anybody these days but the cheap ones are forged in and sometimes machined in china and have quality issues. No matter what you buy I would have EVERYTHING checked by your machine shop before putting it together. Good luck on your build.