Slant six 1920 stall

got back from Methow and ran through the carb, adjusted the floats to 9/32 and cleaned the bowl out as there was a bit of crap there. Took out the idle screws and blew out the idle circuits and others. It runs better now but warm idle in Park is 1300rpm in gear it drops to 500rpm. Driving and coming to a stop it seems like it still wants to die.
Replaced the funky PCV hose as it was collapsing when running.
Trying to figure out how to plug off one of the carb vacuums ports as it is very small.
It has no PS so no booster. I have tried to spray fluid around the carb base and the intake but dont seem to find any vacuum leaks there.
Fuel tank has no vent in the system.
So when you say "Reset your float level to the factory spec. I recommend you pressure test yours to 4.5 psi; it must hold at 4.5 for at least a minute. Longer is better." Are you sayingReset float to factory. Then,
Pressure test fuel delivery @ 4.5 psi or some how pressure test the float? Its a bit ambiguous to me. Can you break that down please? Also "TC"?
It is an electronic distributor so no points.

Cheers.

That's a huge RPM jump from park to drive. Where do you have your initial timing set?