1-8-4-3-6-5-7-2
the firing order is cast in to the intake manifold
Clockwise
No need to if the distributor was not moved.
18436572
Bad coil wire, bad coil, etc...
73 Chevy 350 firing order: 18436572 countercockwise
153624
The proper gap is .035
the gap on the distributor points is .016, the timing is advanced 4 degrees and the spark plug gap is .030
1.8.4.3.6.5.7.2
The firing order is ( 1 - 8 - 4 - 3 - 6 - 5 - 7 - 2 ) The distributor rotor turns CLOCKWISE The marked # 1 position on the distributor cap faces to the FRONT / CENTER The engine cylinder / spark plug locations are numbered : firewall 8 - 7 6 - 5 4 - 3 2 - 1 front
AnswerCheck the distributor and the hei coil.In 1973 you would not have an HEI coil. Just the coil itself. Check to make sure all the wires to the coil, including the plug wire is tight and secure. You can pull the distributor wire from the coil.....leaving a small amount of space between it and the coil, turn over the engine. See if there is a spark jumping from the coil to the wire. If so, the problem is in the distributor. Points and condensor, rotor, etc.