What to tell the exhaust shop.

65 Cuda 340 said
I assume you mean Thrush, not Dynomax. Haven't tried that one, so can't say for sure. I can say that I have one slant six A body, two small block A bodies, and two big block B bodies, and they ALL have offset inlet, center outlet mufflers.

I measured the current muffler and it is almost a perfect match at 14 inches long, 9 inches wide and 4 inches thick, so I think they are correct.

Summitt has it for $28.99, wow. Thrush Turbo Mufflers 17696