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actually it really doesn't matter which motor...whether the 4.9, 5.0, 5.8, 6.6, or the 7.5 liters..... none interchange from '75-'79.... '79 caps only as far back as '77
Distributor cap from 351m/400 will interchange to a 429/460. Other than that I am not real sure. I guess 360/390 interchange too. The small block stuff I am not sure on.
If you are talking about a shell be sure to check the angle where shell hits cab. I believe the 73-79 cab angle is different, so it may fit the bed bit not align properly with the cab.
Just re-read the original post.........as others have already pointed out 79 to 75 is same bed same cab will fit fine as long as it was actually made to fit the 79. I have looked at several that "came off of a ....." but never really fit that truck either so didn't matter what it came off of.
Last edited by TexinCali; Apr 11, 2013 at 01:02 PM.
Reason: new info