on the block above the starter is a casting # that will give you model year and some info on engine. Also pull valve covers and top of heads will also have casting # to help ID engine. The 351 windsor and 302 are very simular only the 351 is taller and wider. Back in the 70s it could be a 351m out of truck and that is a all together different engine family much bigger than the 302 or 351w.
Kelly hotrod - Ford Engines Page 1 here is a website with alot of info to decipher ford casting #
I hope I have been helpful. If more info is needed just ask.
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Thanks Tim