gear ratio/converter advice

Hi all,
Just put my 72 Duster on the road after a /6 to 318 swap. Running mild cam, Edelbrock Performer intake, Holly 650 cfm double pumper. Behind the engine sits a stock 904 from a '76 Cordoba. My guess it has an 1800 stall converter.
I have an 8 1/4" sure grip with 2.23 gears I would like to put in. My question is what stall converter should I use and should I be looking at a different gear ratio? Car will be a driver and not a racer, but I would like the option to look at some kid at a stop light who's driving his dad's Mustang GT and then seeing him in my mirror. Any input? Thanks
Author: mi72duster