have you considered changing the hose that carries the fuel from the regulator to the mixer? (mixer is the top of the throttle-body/carburetor, unless this is a "dual fuel")
what did you set the air gap in the distributor pickup at? is there any side play in the distributor (not up and down, but sideways, like if it had a set of points, the points would push sideways on the distributor shaft).
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