How do identify what year my engine is?

Dana67Dart said
You might want to look at all the hoses and find out where they go and if they need to be there.

I know there’s a vacuum operated solenoid in the engine compartment for the heater valve. My car has ac and all the stuff is hooked up. I’m hoping to get that running too. By the way,when I came home with it on the freeway yesterday it was running rough after I got off the freeway exit. Turns out two of the spark plug wires on the drivers side (the two rear) touched the manifold and burned in half! Will a set of wires for a 318 be the same length? Supposedly this engine came out of a 1971 car.
Decades ago parts stores used to sell wire kits you could make to length yourself. They don’t seem to have those now. All the other wires are new. Guess the previous owner didn’t bother to tie them away from the manifold and I didn’t notice in my eagerness to take it out on its first drive