To do it properly you will need a timing light. Attach it to the number one cylinder spark plug wire and start the engine. Hold the light so you can see the harmonic balancer and check where the timing mark is when the light shines on it. If you need to adjust it you will have to loosen the distributor hold down bolt about 3/4 of a turn. Rotate the distributor very gently until the mark lines up with about six degrees advanced and your 305 should run fine. remember to tighten the distributor bolt back down.
6 BTDC
Computer controlled and not adjustable
On the front of the timing chain cover, drivers side towards the top of the harmonic balancer.
6 or 8 drgee
There is no timing belt on a 305 unless it is an aftermarket belt drive system.
yes
Top Dead Center
6 degrees BTC
same as a 350
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.
The easiest way is to look at the Harmonic Balancer. The 305 has a wider thicker balancer than the 350. Pus the timing tab on a 305 is located ON the timing cover and the 350 is bolted on the with the cover bolts. Riky9
8 degrees.