Well, going by the paint scheme, it's an M&I engine, so it could well be a '62. The propane backs that up, actually. Just because it was taken out of passenger cars in '58 doesn't mean they weren't using the early hemi as pump or powerplant motovation for many years after.
If I recall, most of the M&I engines were 331, 354, and 392 hemis, mostly with two-barrel carburetion since they usually ran at a constant RPM. Usually the non-auto applications used a screwy crank snout and often a different bellhousing flange bolt pattern and/or depth. If that's not the case with the engine in the auction, it'd be a hell of a start for a rat rod or gasser project--ever seen the inside of a propane motor? Usually pretty nice in there...
To my knowledge, the 273 high-perf (including both the regular 235-horse 4-barrel and the nasty 275HP D-Dart version) and the 426 Hemi were the only M&I engines ever installed by the factory in passenger cars... though I have no idea why the 273/235 was assembled there.
