I put it into gear and it dies.

Yea maybe I used the wrong wording when I said to add it as a tuning tool. But there is zero downside to using one and actually significant sealing benefits and maybe even a little power in the ring seal. The idle bypass air will definitely help the stalling while in gear problem. That’s really the point I was making. I do agree with @67Dart273 tjough I think we wandered a little off course. Let’s make sure the PO adjusted the valves properly before we get too technical.
cant adjust them, they are the later ones. the engine is a 73.