Try cleaning them.
The timing for a 1985 Chevy 2.8 V6 is 100 BTDC.
10 degrees btdc
8 to 10 degrees
The timing should be set to 10 degrees BTDC.
The typical timing for a 1985 Chevy 454 is 8 degrees before top dead center. The vacuum line removed from the distributor and plugged. The engine warm and idling at 700 rpm.
the answer is 10 degrees and the firing order is142536
if it is a 3.8 liter it is 165432 for the 2.8 it is 123456
NO, It is electronic ignition.
You could put a vacuum gage on the engine and time it for peak vacuum. A timing light is still better.