Just keep in mind that many stall converter manufacturers greatly exaggerate the stall speed of their products. Also, the stall rating is based on a baseline HP and Torque, so low performance engines need to have a slightly larger stall converter than recommended by the cam manufacturer. Usually 200-500 rpm more.

I suggest that unless $$ is a big factor, choose a good quality 10 inch or so converter with an anti baloon plate (for future needs). There is a cheaper alternative on Ebay, called redneck converters. I have a couple of them and for the price they perform well.

A good stall converter can give you a big increase in performance.