Sbc 400. stick with powerglide or go 350.

I'm having a hard time finding a torque converter with a decent amount of stall to put behind my 400. should I just go get this rebuilt th350 off this craigslist dude? I think torque converters 4 those would be a little more common for a highway cruiser.
are torque converters for the powerglide w/stall not used? woukd I be better going with the th350?