Does not make sense that you are missing engine ID code on front pad? Most web sites list the cast as somewhere between 64-68. 195HP and 220HP. Again, it should have an Alpha Numeric engine ID unless replacement engine. Your does not seem to even be a serial number (VIN). Clean that pad off with a wire wheel. Now you have to get jiggy and get the head numbers, head symbol, etc.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn