Dissapointing performance

mguner said
If you don't have an X or H pipe adding one will also help your problem.
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Maybe few h
justinp61 said
Yes your converter and rear gears will affect you're trap speed. If it can't get moving off the line it will not show it's potential. BTW the carb and exhaust are to small for that combo and your gears and converter are wrong too. If you're dead set on the gears and converter put a smaller cam in, you'll be much happier. The heads picked up almost 2 mph so it is making more power than before.

BTW where is your initial timing? With that cam it should be 18-22°.
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20 is my idle timing. Im not going backwards in cam maybe I do these upgrades what you succest me to do. 2 mph better equals something like 20 hp. I was hoping more I dynoed my old engine and it was 300 hp with smaller cam, old heads and 8.4 compression ratio.