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the gassers in these years got:
300, 302, 351w and 460's
no 351 Cleveland engine was factory installed in a truck. Plus it was killed off way back in '74.
There ya go ... the 351C became the 351M in 75 when they started putting cat converters on the cars .... I don't know the last year the M was available in a truck ... but I am sure that trucks didn't get cats till a few years after 75 ... they had a loophole similar to the one the auto industry exploits for EPA fleet average MPG rules by introducing soooo many SUV's now.