Replacing 77 904 with 69 904

Just make sure that it really isn't much older than that because the early ones had a smaller crank snout and different input splines. Plus it probably won't be a PTK part throttle kickdown valve body and Idk if you can switch them. You know you can put 318 drums in there or just use the extra bottom forward clutch pressure plate as the top pressure plate to add an extra clutch to either drum.