350/th350 question

[86gmc23]

I let engine warm up. I did adjust accelerator lever screw, it seemed to help some but didn't fix.  Only difference was one time I snapped throttle is bogged way down, then caught it self at last second and shot some flames out of carb. I'm thinking I just need to rebuild my old 650 carb, the 750 just needs to much fuel.

[bd]

WOT accelerator pump jet squirts nice solid stream for around 2sec.  I sprayed some carb cleaner over carb while I snapped throttle and it revved up without stalling. Jet is a 31, do you think that means I should set up the jet size?

Bd I didn't get a chance to check that since I just saw it but will get into it more tomorrow. Float levels are just below sights. Distributor is vacuum advance.

I let engine warm up. I did adjust accelerator lever screw, it seemed to help some but didn't fix.  Only difference was one time I snapped throttle is bogged way down, then caught it self at last second and shot some flames out of carb. I'm thinking I just need to rebuild my old 650 carb, the 750 just needs to much fuel.

Lift the distributor cap, grab the rotor and rotate it.  Does it rotate freely ~10° then snap back when you let it go?  Before making any more changes to the carburetor, make sure the centrifugal advance mechanism is functioning as it should.  Weight pivots wear out and reluctors seize.  You can also unplug the vacuum advance then watch the timing marks with a light to verify centrifugal advance as RPM changes.  Verify that ignition timing control is totally functional before expending any more time on fuel tuning.  If ignition isn't right you're chasing your tail and prolonging your agony!