Typically it is the one that points toward the number one cylinder. Technically it can be any of them as long as the wires are in the correct firing order. When cylinder number one is a tdc, the rotor should be pointing at the number one cylinder. Thus the number one plug wire.
0.045
Clockwise. The 72 Chevy 350 engine did not come stock with a HEI unit. No matter, the rotor still spins clockwise.
1.8.4.3.6.5.7.2
No.
The charger is faster as the Chevy has a 6 cyl.
I've never seen a 75 Chevy 350 that didn't come with HEI, as it was a mid-year introduction in 1974. However, if such a thing as a 75 Chevy with point distributor exists, there would be a steel wire running from the ignition switch to the hot side of the coil. The steel wire would need to be replaced with a copper wire. The steel wire acts as a resistor to reduce the voltage to the coil, which is not necessary on an HEI, and would limit the total voltage the coil could produce.
On the dist., cap, where the wires go in, there is a tab labeled TACH.
If you stand in front of the engine, It will be the second plug from the front on the left side of engine.
I DON'T KNOW!
yes, as long as the 454 is not a tall deck block.
0 Top dead center.
depends on the ignition system you're using. Hei