Matching cam to converter

My new cam is on the way, along with my reworked heads next week. I need to get a new converter but I'm not sure which way to go. I picked a Crower cam 271/284 dur.; .486/.496 lift for the 383. I want this to be mainly for the street but it will definatly be going down the track a some. The 8 3/4 has 3.23s which are going to have to stay there this year, then I'll swap up to 3.91s. How much stall is enough or too much?