Advice on converter selection

If you want it to run get a 3500 it will stall at around 2800 and idle in gear with that cam without wanting to tear the drive shaft out when put in gear. All 340's stalled at 2600- 2800 from the factory.

The same converter in a big block will stall at 3000 to 3300. Converters are rated with high torque Engines. Low stalls in a truck are 2500 they stall at 2000 to 2200. That converter in a muscle car you will need 410 gears and it will still be a dog. Good for pulling a trailer though. Been there and know first hand. checked stalls on many muscle cars back in the day. I would always use a 340 converter in a 440 car. tremendous performance gain for little money at the time.