I've never attempted an 833OD into an early A, but let me throw this stupid question out there. Would it not be easier to take a stock early A bell housing to a machine shop, and get the register hole bored out to match the bearing cover on the 833OD? You could then use all of the stock linkage and avoid all of the line up problems if that would work. Chances are, if you're putting an 833OD into something, you won't have an overly hopped up motor anyway. 833OD's never had a reputation for being strong enough to handle much HP.