67-69 Barracuda 8.25"

ok this maaaaay be a stupid question, but would I be able to rebuild the 7 1/4 with gears that would be able withstand more power? I've come to terms rather quickly that I don't want to swap due to the fact that I would like to keep the numbers matching, but I still wanna rip apart the block to beef up the little guy as much as my wallet withstands. That plus the fact that if I do the rear than I have to do the front and those dollars could go to other parts of the build that need to get done.