What is a good stall to go with a 3:23 Sure Grip?

I'm in the same kinda situation. Fresh 70 340, with stock 273 904 and verter.
323 sg.
I was going to do rear gears 1st, but majority here said get proper torque converter 1st(which I will), then "maybe" look for 355's. Priority is tc 1st(for me anyway).
Good luck! :thumbsup: