340 camshaft question, yea another one.

The transfer slots are a square looking at the bottom of the carb. Had to drill holes in the throttle plates to get it there on a Edelbrock 650.
And yes the idle was at 850 to keep it from stalling when put into gear. I know the converter is a large part of the problem. I did the jack stand test last summer and you called it. The engine wanted to stall when coming to a stop.