Hi,
I am trying to figure out if a plow off of a 1974 f150 or 250? custom fit on a 76 f250 highboy?

Snow-plow/new tires: with a"Free" truck!

to be put on:

 

The problem is it's an f150 so not the first choice for highboy parts .. The plow however should fit but make sure it is bolted and not welded to the frame .. I would look for a meyers plow brace .. Once you've found the brace parts for the plow are readily available .. Here is what you need .. Just make sure it's on a Highboy chassis ..