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I believe there is a difference between the 2 trucks regarding the space between the frame rails. So, If it mounts to the frame, you may need new brackets.
One of the other guys can confirm. We don't see many snow plows here in Texas :-)
The framerails are spaced farther apart on the 79F150 than they are on the 70. So you may have to tweak things a bit to make it fit. Nothing an arc welder can't handle. DF