Almost forgot, the 351W ranges from about 1968-1995 (production years). They are still easy to obtain.
The 351C was around from about 1970-1976ish for the most part. Trucks may have had the 2v later than that, but the prime 351C's were between about 70-73.
I'm actually not a specific expert on the engines, so I may be off a couple years.
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