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Only major difference as far as I know between 72 and 74 are the engine mounts style, steering linkage (center link) and k frame. 72 uses biscuit style eng and trans mounts, 74 uses the spool style. The corresponding k frames are also different. I dont beleive this will affect header fitment...

When I was young and poor, my 80 volare ex cop car, 318 with single exhaust needed a muffler. I straight piped it but left the cat converter in. It sounded great and was not too noisy.

Remflex and never look back. They are awesome, you can drop the exhaust and re use them many times. They also make, IMO, the best header or manifold to head gasket. They are available on amazon or the online auto parts supplier of your choice.

I believe one or both of them are also thd same for e body.

Shouldn't be using a tap to chase holes...... should use a proper thread chaser. Difderent taps, especially cheaper ones, will remove more material resulting in a sloppy hole... no one likes a sloppy hole, LOL. Thread chasers do not cut, they just clean and should work on a work on a helicoil...

Guys used to do this, in fact I believe that some mufflers even came.with a drain hole. The idea is if the car only ever makes short trips it never has a chance to burn off moisture (water is a combustion by product) out of the mufflers, where it accumulates and rusts the muffler out...

Two perfectly machined flat surfaces will sit flat to each other and not leak. Add a gasket, especially with hot exhaust and expansion / contraction with heat cycles and you have a big potential for a gasket blow out and leak. Once there is a leak the hot exhaust gasses will actually erode the...