[Gaz64]

Originally Posted by D111

The best that I can get after tuning the Low idie screws is about 14 to 15 at 950 and about 12 1/2 When it drops down to 750

also replaced both carburetor return springs With Stronger tension.

But those conditions Persist slightly . letting off the gas in gear there is still that slight tugging and when left to idle for a couple of minutes It still drops Up to 200 RPMs.

The idle rpm drops because manifold vacuum also drops.
It is a trade off for running a carb with an "average" idle circuit and a large cam.