The transmission section of the 59 (Muncie/4 bolt side cover) and your transmission would be the same. The internal parts are the same. The BW OD section replaces the tail shaft on the stock transmission. With the exception of Corvette's and a couple years of Pontiac's these early transmissions were identical. You can even use parts from the 58 through 67 transmissions with the short tail shaft. Lots of these units out there, I find them all the time.
Fred
