CB743HN And CD743HNX
Buy them coated from Calico. Or if you don't want to mess with having them coated, buy the CB743HNK (K = precoated)
The "X" is .0005 larger to allow for the coating.
It's not unusual to mix HN and HNX halves.
Set the clearance for a street engine between .0025 and .0035, on the high side as you go up in power.