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"AHHH... Venturi size!!.. one thing I was wondering about myself. .. what's considered too large.. My main jets are 180's .. if that helps any"
Your Webers should have these approx. specs:
Venturi 30
Main jet 125
Air correction 180
Idle jet 55
Emulsion tube F26
Spitting back usually means the idle mixture is weak (lean), due to a vacuum leak or air leaking past the throttle shafts (worn shaft bushing).
If the engine is using too much fuel (stock?), I'd say the mixture screws are not adjusted correctly, the float level is too high and/or fuel pump pressure is too high.
Idle mixture setting is tricky. a half turn could be the difference between okay and a little too rich/lean. Many folks adjust the idle mixture with a CO meter.
A main jet size of 180 could be the problem, although I think this is a typo.
Did you recently rebuild these? Have you verified the jet sizes?
Sherwood
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