I am wanting to build a 500ci Hemi or larger for my 68 Charger project. It will be a street/strip type of build.

Where is a good place to buy the 426 aluminum Hemi heads and iron block at? I am wanting the block to have the RB type mounts.
What should I look for in purchasing a new iron 426 block and aluminum heads?

Should I buy the block in rough or finished bore? What about the lifter bores finish?