New to trucks new to message board

[Nova Scotia Chevy]

I just purchased a 1968 C-10 step side from a guy who disassembled it and gave up. After stripping the rest of it I am now in the reassemble stage (beginning). I have air bags on the way along with rack and pinion steering. My question is simply. What headers work best with a Big block and Tremic five speed non hydraulic clutch. Looking for something not to low that works around Z bar and steering stuff. This is my first post and I am new to this stuff so forgive me if I did something wrong.