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I used a Champion on a '78/F250/400 and it fit as advertised. Works fine. For '77 to '79 they only mention the V8's. I don't know why. I would not think the radiator support is different. Worth a look at the pics for hose compatibility and call to Champion I believe.
In that case, Autozone or Rock Auto or your favorite parts store should have a reasonably priced offering. Or "radiators.com" which has served me well a couple of times.
I don't know anything about this company so I'm apprehensive to endorse or buy myself, but I've been eyeing a radiator they have for a 302 since it's only $53 (plus shipping).
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