headers vs manifolds on a 318 2bbl difference ????

rumblefish360 said
Most dyno tests have cams that start at that area of rpm. Any reasonable hot rod even if equipped with a smaller cam like a 220/224@050 should, for best performance, have a converter that flashes around that area even though the cams power band (listed) is lower.

Remember a dyno is testing the engine at WOT, not part throttle.

Mostly because the cams tested at 3K plus aren’t designed to operate under full throttle conditions under 3K.
(That and the above.)

I agree on all your points. Considering this van engine is a stockish 318 that would be pressed to spin to 5k rpm, a dyno of this engine would give more usable info if started at a lower rpm. Even then we don't get much info about part throttle driveability from dyno testing.