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if it's still the original engine then it'll be a 351 M the windsors didn't come out until 1980 if it's been replace i'd need to know more about the engine
i've got a 351M it's been a great motor. if your lookin to install either a 351M or a 351W. I'd go with the 351W since more aftermarket parts for it and parts much cheaper.
Depends on what it goes in. If it wasn't offered/original in the truck you might have to change a lot of things. I believe the Windser would have more potential, but then you could change the 351m to a 400.