try to use edelbrock angled plug heads and the are failing hedman headers. and idea what headers will clear spark plugs?
81 z28 auto,ac.

Super Comps work great with my angle plug AFR's. In fact there is MORE clearance with angle plug AFR's and these headers. Not sure whether Super Comps work with A/C or not.

would you know a part no.??????

I have Super Comps with the Edelbrock angle plug heads. Plenty of plug room.
Part# 2117
Don't have A/C

Depends on what kind of angle plug heads you have... there is 'traditional angle' heads and 'L98 angle' heads.

Hedman # 65104 clear angle and straight plugs
1.75" primaries and fit extremely well.