early A body exhaust EXPERTS!
Toughest part for exhaust on an early-a body is right around the torsion bar area, as you can see on that pdf from tti you posted a link to. Passenger side especially, and you can see how its all squigly in the drawing. Do you have a 90 degree oil filter adapter? What exhaust manifolds are you using? I used to use some shorty oil filter adapters, and have a few left I think, after I went to the 90 degree oil filter adapter