According to one of Fords websites : The 360 cubic inch / 5.9 liter , V8 engine in a 1975 Ford F-150 has a spark plug gap of : ( .044 inch )
.044 inch ( according to motorcraft . com )
.035 if you have points(up to 74), and .044 if it's electronic(74 & newer)
The standard spark plug gap for the Dodge 360 from the 1970s was .0035. It was a common gap for most of the muscle engines of the day.
The point gap for a 1968 Ford with a 360 Engine are .017 without European Commission and .21 with European Commission.
.040 is factory...
.035"
1976 was the last year for the Ford 360 ( 5.9 liter ) in the Ford trucks and my information goes back to 1968 and the 360 cubic inch is listed in 1968 for the Ford trucks
15426378
.035 inch
.040 inch
.035 or .040, depends on year.