A 79 shouldn't have points to gap. It should be an HEI distributor.
Breaker Gap, Inch: .015
The gap is .035
i'd put them at around .03-.04 gaps on them. that's a pretty general spark plug gap.
.045 spark plug gap
.045.
0.019 point gap
.019 in or 19 thousaenths
17 or 18 thousands your choice
set the point gap to achieve 30 degrees dwell.
The point gap should be set for 30 degrees dwell.
0.019
.035