the 283 was an option for 1960, shouldn't be too hard to rig - and yes, most V8 bellhousings do have the mounts, look at older ones, although you'll have a search to find one with the fork on the pass side for your hydraulic clutch - positioning to avoid changing the driveshaft should work because the trans won't move, but you'll need to find a fan shroud as the fan will be too far back from the rad .... might want to consult with
4-5-6 chevy trucks, owner is a member here you can find in the member list
Bill