I would think that it would be worth a call to Comp cams to see what the tech people have to say about the combination, and if they have any thoughts about what would be the best stall speed for that cam.
I am putting a 454 together for my 55 truck and I was able to get all the information I needed about the best cam for my needs.
I am running a 280 hydraulic grind with roller rockers, Crane lifters, and single 4 barrel Holley. I will still stick with my present stock converter and TH 400, because it is in excellent condition. I don't run really big tires, so if I happen to slip on the gas pedal all I will do is shorten the life of the tires and make a lot of smoke. MMmmm, smoke.
Bob