20degrees
No
to my knowledge 1980 Chevy v8 engines didn't have ignition points, and dwell settings are for points.
Should be 28-32
28-32 degrees
28-32
30 degrees dwell
A dwell meter is used to check the setting on a POINTS type ignition system, these have not been used in quite a few years, and for sure not as late as 1993.
Should be set by dwell 28-32 degrees approx. .017
the thickness of a paper match stick is real close.
An electronic way of setting the gap in ignition points. This is more accurate than using feeler gauges.
The plug gap is 35 and the dwell setting is between 28-32, I like to set them at 30.
.017 The dwell on a 1972 225 ci slant six is 41-46 degrees, the point gap between .017 and .023. So .020 would be your best place to start.