Not sure on the timing belt I do know it does turn over supposedly. I was wondering if any one could tell anything from the Serial number. �:-?
Serial number will be at the water pump area, top of block surface. You showed us a casting number, that same casting can be timing CHAIN or timing gear I think..., and it is probably a 2A engine. Sean over on the 2A page would be the man to ask or Bob W, as they have a better handle on casting markings than I do.
The remark about two complete revolutions is always a good idea on any used engine. 2 revolutions gets a full rotation of the cam so if any valves are stuck hard you'll find them. I like to turn it by hand and try to feel if it has any compression while I am at it.