If it is a motor from the late 70's pick up truck it is a 351 Modified. And in the early 70's they put 302, 360, 390, and 460's in the trucks. If I am not mistaken, Ford didn't put a 351W in the trucks until the 80's. Are you sure this came out of a truck? A 351W from a car in the 70's would have been a 9.2 deck height. An example casting # would be D4AE-6015-AA and then like a 7M2. All this is cast right above the starter. BTW, the easiest way to tell if you have a 351W or a 351M is that the 351W looks exactly like the 302 only slightly bigger. The 351M is a totally different animal.
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