torque converter/stall, help

It really depends on what rpm the cam has its peak power at. If you get a matching TC with the stall around the same as your peak performing rpm range in the cam, you SHOULD be ok. That being said, you do need the B&M flexplate for a 408 stroker, and you need to take into consideration everything else. I second what PettyBluDart said. Call up TCI performance or B&M and tell them your specs. 2500 sounds like a good stall for your setup IMO