So...something goofy happened. I bought a brand new water pump for my 351M hot rod build that I am doing and turns out it actually fits a 351W; it must have been put in the wrong box. Fun fact; the C/M/W pumps are all the same, except the W pump is clocked a bit and the bolt holes drilled in different spots.
Well, anyway I got another pump and now have a useless 351W pump floating around. Dad doesn't need it, so if anyone here is interested in a brand new water pump (I just painted it silver so it wouldn't rust), I've got one. I got it for dirt cheap so it's free to a good home if you pay for the shipping. I have both gaskets for it somewhere, but if I can't find them you'll have to get them.
Cheers :)
1978 F150 351W
1979 F150 "410M"
1979 F100 302
1979 F250 400
1987 F150 300
1990 F150 302
1991 F150 300
1995 F150 (1985 clip swapped) 300
1997 F250 351W