rev the engine to about 2500 rpm's and turn the distributor until you find that sweet spot.
That requires an engine scanner.
The timing on that year engine is computer controlled. It requires an engine scanner to set the timing. YOU CAN NOT USE A TIMING LIGHT.
On the front of the timing chain cover, drivers side towards the top of the harmonic balancer.
Chevy 302the 5.0 302 is a ford engine do you mean the 305?
Is a 2.8 liter engine a 305?
8 degrees before top dead center.
maybe check for a worn CAM LOB.
You could put a vacuum gage on the engine and time it for peak vacuum. A timing light is still better.
There is no information on the internet about what the special feature of the Chevy 305 engine is, in fact, the Chevy 305 and 350 are interchangeable, one is just an older model.
To adjust the timing on a 1992 Chevy 305, first ensure the engine is at operating temperature. Locate the timing mark on the harmonic balancer and the timing tab on the engine block. Use a timing light to check the current timing by connecting the light to the number one spark plug wire and pointing it at the timing mark. To adjust, loosen the distributor hold-down bolt and rotate the distributor slightly until you reach the desired timing, then retighten the bolt.
6 or 8 drgee
That requires an OBDII engine scanner to do that.