If the block is bored +.040, you should already have the pistons. The honing step is what properly sizes the bore to the pistons you are running. My .02, if it's already bored, buy forged pistons, Speed Pro or similar ,run as much compresion as you can..10.5:1 at least..You may need to mix fuel, or retard the timing on the street. I'd run the ported 360 heads if they flow decent, or have the J heads re-done to flow well if they dont. I'd run the Comp XE274S cam. Make sure the springs match it. For gears, I'd be running at minimum the 4.11s..But look at 4.30s with a 27" tire.