Per Champion spark plug applications chart, the gap for 1989 Chevy 305 (5.0L) is .035.
The Spark Plug gap is .045
.045
.045"
.035
.035
.45
The recommended spark plug gap on a 1996 Chevy C1500 with a V8-305 engine is .060"
Sorry but I do not under stand your question.
.035
Drivers side, first spark plug in front is #1
0.035
Depends on the year, but the 305 used the AC Delco R44t for years.