You are deep in the custom piston range, need to figure out finished bore and deck height, likely end up somewhere around 1.325 with a 6.70 rod and the dish you'll need depends on use, but it'll be a big one at that size. Depending on use, I'd probably go 2618 alloy, but if all street, the 4032 is very good and can run a bit tighter tolerances
Brent will likely chime in, he can get you what you need from Racetec
As far as rods, I like Molnar at that power level, K1 Technologies are also good, very similar, tiny differences in bolts, and you can go up from there. Stay away from regular SCAT or Eagle at that range. Heavier and lower quality
As far as the BT 2x4 or a TW, I am a single plane guy, especially with cubes, but can't go wrong with either