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I talked to a gentleman on here who runs a Pure Stock Drags 340 GTS and he claims .3 tenths improvement on an X-pipe 2.5" exhaust alone.

A guy local to me has a 71 340 4spd demon and he had headers put on when new. He said they are doug thorly. Which yours kind of look like. As for the fender well headers, the picture in my profile is a 69 Dart 340 that I now own. Its a one family owned car. The car was bought new in...

Not a Mr. Norms car is it?

The 340 swinger I have had the manifolds changed to fender well when brand new. But no such things as factory headers on an A-body...other than a factory hemi super stock.