I've run this cam with stock converters, no issues as you are experiencing. I'd go to initial timing first (I'd guess 14*-20* would be a place to start). Then the idle circuit on the carb.
Timing is @22° according to a Matco dial back, still pulling vacuum in park @1200 rpm.. need to locate a piston stop..seems like she wants more timing. Fires right up, no drag on starter
