904 band adjustment for a 408 stroker???

If the transmission is one that only has a 3 disc direct drum, it really could stand upgrading. That 408 is gonna have a ton of torque. Unless you know for sure what's in the transmission, there's no way to tell. It'll probably last a while with a good shift kit, like fishy68 said, but if you upgrade it with a few inexpensive factory parts, it will dang near be indestructable. ...and like pettybluedart said, matchin up the converter to the rest of the car is really important. Lastly, that lockup converter ain't gonna make it. It'll be the first part to fail. Unless it is a high quality aftermarket piece, look for it to grenade and likely take somethin else out with it.....usually the front pump. The factory lockup units were just not made for high torque. You 408 is gonna have at least 408 LB FT of torque I would imagine. Probably more. I would advise losin the lockup feature.....but that's just me. If you really want to retain the lockup feature, or go to an overdrive unit, the A-518 is really the way to go. They were available in a non lockup version that uses a standard, non lockup converter. Non lockup converters are just much stronger, unless you go with an aftermarket piece as said before and they are very expensive.