How do I pick a TC??

I have no idea of my cam specs. And neither does the guy that put it together! He just knows it’s a comp cam, bored .30 over, x heads (will be upgrading to aluminum) RPM performer intake, 750 dp, 340 small block. 4.10 gears, 8 3/4 rear, sure grip, 727.

but how can I pick out a torque converter if I don’t know the cam specs?? Someone please point me in the right direction. I like to putt around town, drop the hammer every time no one is around and run it at the strip a handful of times a year. Thanks!
Do you know what the cam sounds like? Can you post a video?