1974 318 duster. Can I port/polish these heads and get enough power out of them?

toolmanmike said
Way back when, I put a set of Mickey THompson Try Y's on my 340 in my 73 Challenger and off to the strip I went. With no further tuning or modifications it went slower by a few hundredths. The stock manifolds and exhaust must have been pretty good back them. Good thing I kept all the old parts to put back on. A awful lot of work for no gain.
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The stock manifolds were pretty good but the Tri Y’s were probably better and being better and flowing more air through the engine that caused the engine to lean out. A bit of carb tuning is typically needed after making a change that effects air flow.