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?
maybe check for a worn CAM LOB.
8 degrees before top dead center.
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.
6 or 8 drgee
That requires an OBDII engine scanner to do that.
A loose timing chain can cause the 305 h to jump time. with improper time, the engine will not start.