How far in the future are you planning on building this 454? If it's a couple years or more I wouldn't bother trying to compromise between what you need now and what you'll need then. Buy exactly what you need now, and then if your needs change in the future, by what you need then. In my opinion you'll be happier if you buy a torque converter for you exact application now. I'd say around 3000 stall would be about right. About the cam, if you don't know what it is, don't put it in. Cam need to be matched to the rest of the engine/drivetrain. If you put in a cam that's too big the engine will sound cool, but it will be much slower. Everything should be matched up, again why I say to worry about the 454 when you get there.
As for the tranny, I've never used that tci tranny, but it's probably decent. I'd use it for now and upgrade and use it or sell it when it comes time for the 454.