How much RPM drop from park to drive with stock type 340 convertor

Hold the brake as tight as you can to prevent the wheels from spining. Put the throttle to the floor and see where the tach stops. That would be your brake stall. Any stock performance motor should have at least a 3000 stall converter. Different motor combos stock or not will stall different. The highest I saw a factory 340 converter stall with my own eyes was 3100. the lowest was 2700. Normal is around 2800. I have a 80's 318 4bbl police 904 in a duster right now and it stalls at 2500 but it spins the tire. Once the car gets a suregrip it will probably go a little higher.
Man that's some good stall from a stock converter. A friend offered me a 3500 to try so I'll probably do it. The car will never see the track but I want it to do what its supposed to when you wack it from a light. I will ck the brake stall but not expecting much. Thanks OMM