360 smogger or not??

The 2500 stall converter would be the ticket for that combo with your 3:91 gears for the street, and you could go lower to your 4:56 for the strip. As mentioned, for a starter converter, without breaking the bank, either the mentioned Turbo Action or the MP 175K should do the trick. You'll need to either weld balancing weights to the converter, or use the B & M flex plate to any converter you use behind that 360 - unless you have a pre-balanced 360 converter of course.