318 and 340 exhaust manifolds are completely different. Just go to a local muffler shop and have a system made, probably cheaper than a complete aftermarket system anyway. I was at my local shop today, they will bend up anything I want made... twocents


The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.

JB Rhinehart, Realist

A-Body's RULE!