That is a mean 305 Fbird. Is that the one you are working?
IF you are pulling the trans back for a converter. You might as well put a 3000 stall in. The 2200-2400 are to close to the stock stalls from the cars I remember. The 90's and on, had factory 2400-2800 stalls in what you may loosely call performance models. Even a 3000 is going to foot brake around 2200. You are not likely to lose drivability at that level.
Your cam is similar to the RPM design. That is a little much for a 305 driver, but still it should be workable. It will like/need the compression increase you factored.