This is a '61-'65 Corvair transaxle. I believe a Kelmark adapter which required running the transaxle backwards. In addition, I believe a reverse rotation cam was needed for the engine. The black diff cover was for cooling, appearance and to keep the top of the case from flexing open under load which was a problem for R+P life expectancy. Most V8 Corvairs, Crown or otherwise used the '66-'69 unit which used a stronger tranny based on the Saginaw used in "lower HP" Camaro,Nova cars.If you follow the set up instruction for this transaxle it will handle a small block of around 350 HP ( my experience) Parts are getting hard to find and with better choices now available they aren't that desireable. I'm currently building one using some tricks I've learned, but would ultimately like to go with an Audi. Lighter weight, more gears and more legroom! There is a great article on Rick Norris' Crown Corv8 build with a google search. Cheers, Dave