It’s got a new fuel system, plugs and plug wires, distributor, took the carb and msd ignition off another car know nothing is wrong with them put a crank trigger on it and nothing so far has helped it.
Does good 1st to 2nd shift, does it sometimes in the higher rpm’s in 2nd, but always does it in 3rd I shift on 6600 just goes to about 6000 in 3rd and levels off put a little bit then falls back and started pulling again it ain’t a missing more like fluttering or surging