.030"
73 Chevy 350 firing order: 18436572 countercockwise
8 degrees before TDC
8 degrees BTDC.
If that 55 originally came with a small block 265, the 73 350 would drop in. If that 55 had a straight six, nothing would bolt up to the 73 350.
73-74 Chevy van.
First find what 73% of 350 is. 73% of 350 is 255.5. Now find 25% of 255.5. 25% of 255.5 is 63.875. 63.875 is 25% of 73% when the total is 350.
According to the Chilton's Collector's Edition 1972-1979 Auto Repair Manual, the 302 is a 1972 motor and the point gap is .017. The point dwell is 26-30 degrees.
I get about 20 on my dads 1975 scottsdale 350 2 barrel carb I had a 74 with an engine from a 73 Impala. With headers and performance mufflers it got about 14 on the highway. A 75 would probably be about the same.
0.045 45 thousands
www.motorcraft.com shows Point Dwell as 24 - 30 / Point Gap .017 / Ignition timing see Emission Decal on a 1973 Ford truck
Turbo 350