As for determining the year of your engine, you could try looking for the engine ID tag, if it's still attached. If memory serves, it would be found somewhere near the distributor or coil.Try to take a glance at a Haynes Ford engine overhaul manual, it may give you specific locations to locate a tag. There's a section on IDing engines, if I remember right.
There should be a serial number somewhere on the engine block. It's probably going to take a lot of looking around to find it. The serial number will be able to be looked up and give you more information about the engine. Good luck.
〉 Answered on Feb 27th, 2008 by Suzanne Grego, Technician at City of Philadelphia Fleet Management