The '65 bellhousing used the little 122 tooth 9.5 flywheel. Brewers used to offer the bigger "cheater" clutch that would fit, but I don't see it listed anymore, maybe I'm just missing it. They do offer custom flywheel/clutch combos from Ram that fit the 122 bellhousing, but a bit pricey. If you try to use the later 130t. flywheel, you'd have to get the later bellhousing too. Which means a modified clutch linkage, which you can do yourself or buy from Brewer's.
