340 Build advice needed!

well that solves the roller lifters now i just need to make a cam selection

Do you know what your compression will be?
You do realize that solid roller springs are fairly expensive?
Comp's 917 springs will work well, but you'll need harland sharp rockers to clear the springs and handle the spring pressure.
Plus the pushrods need to be fairly stout, no 5/16 .080 wall IMO.
Just want you to think about the things you'll need and their cost.
Brian