Here is a theory. One thing that could be happening is the choice on the vac advance source. Carb baseplate means you're advanced at idle. So I assume you tuned the car with that condition present and you tuned it like most of us do... with the car not in gear. Once you kick it in drive now the TC is loading up and contributing drag to the engine. RPM's go down, and so does the vacuum reading on an engine that already makes very low vacuum given your cam. When the vac drops, now your advance falls off a bit. This acts to further push your idle RPMS down, and your fuel mix isn't calibrated to live at that level. Outcome: stall.
So you have some options. Move your vac advance to a tuned spark port above the baseplate so it's only active on throttle (and retune). Or try to adjust your idle mix for much lower idle RPMS. Have someone put the car in gear while you read the timing and see if you're getting a big swing.
So you have some options. Move your vac advance to a tuned spark port above the baseplate so it's only active on throttle (and retune). Or try to adjust your idle mix for much lower idle RPMS. Have someone put the car in gear while you read the timing and see if you're getting a big swing.
