I am always getting phone calls from people wanting me to help them identify engine parts by their engine casting numbers. Guys find an engine block, a cylinder head, maybe a crankshaft and want to know if it is what they need for thier project. Or they are trying to fugure out what the engine is in a car they have.
The Automotive Engine Rebuilders Association has a great searchable data base that is available to all AERA member machine shops. This data base covers all makes and models and goes back almost 100 years on some. It does not get into some of the details that some of the performance oriented ones do, like rare high horsepower engines etc, but it can be invaluable if you are trying to figure out what type of engine a cylinder head, block or other part came from. Keep in mind that this data base really seems to be directed more towards the production engine rebuilder so it is not going to tell you much more than what engine the basic casting number was used on.
So if you are trying to identify an engine, call you machine shop and have them check it out for you.
You should also check out the AERA web site. If you love working on engines, are looking for a machine shop or just want more information about engine rebuilding and repair, there is plenty of good stuff to be found there.