I have the Clifford Research headers, p/n 52-0960. I paid $93.50 new at a speed shop in 1978. They were the only game in town then for L6 Perf gear. I think Hedman only made V8 stuff then, but I'm not sure. I used to run Steel Packs by Weiand straight out of the collectors without any exhaust tubing, but they used to fall off. [Steel pax use steel wool instead of fibreglas, but are otherwise like glasspacks, except they burn out less often.] No longer available IIRC.
By the mid-'80s I got talked into a fancier dual exaust set up thru turbo mufflers, exiting behind the rear tires at a 45* angle. Also the mechanic suggested an "N" style crossover tube. It increases my low end torque. Pulls uphill real good. It's quiet at idle, but gives out a wildcat-like snarl on the freeway.
