Pre Fab Exhaust

Its because of the passenger 'squeeze' between the tank and the leaf spring. In general 2"-2.25" is the biggest you can go without 'really' trying to work around them. Id suggest going with a large single for a street car but the only prefab is from accurate and is stock 2.5" and 2.25" high-perf stuff.

You might try buying the summit, jegs, or heartthrob kit and have the local muffler shop make a pair of headpipes and rework the tailpipes a bit.

OR, Ive heard good things about these guys...
http://kepichexhaust.com/items/comp...in-aluminized-steel-cryes51-74dlal-detail.htm