The converter is a 1978 and up 11" (wide ring gear) 727 Lockup for a 400 engine. Stall speed rating is probably in the area of 2400-2700 rpm, depending on the application from Chrysler.
I don't know what you're size engine you're running, so the stall speed, in your case, may be lower than what it's rating is. It's just a rebuilt converter for stock applications. Nothing wrong with the converter, and Recon from my past experience built pretty good stock converters.
You don't mention anything about the engine in your car, so it's almost impossible to give you any advise as to what stall will work best for your setup.
