Hi Bob,
I don't know much, 'cept that I put a T5 behind mine. I also know I have a 4speed(granny first) from a '60 (opendriveline) that was behind a 235 taking up space in the shop. Also got a 3 speed from a '59 (thanks Photo!) sitting around. All will bolt up to you're 216 bellhousing.
If you want/are going to use that three speed or four, chances are you can get either off my hands real easy.
Good Luck.
