I checked my motor manual and the 1967 273 is: Point Gap .017, dwell angle 28-32, breaker arm tension 17-20, advance starts 4 @ 500. full advance 17 @ 1900, inches of vacuum to start plunger 5-8, max adv. dist. deg. @ vacuum 13 @13. This is based on the 2 barrel engine. I'm posting this so you can see what type of settings it had in stock form which wont be much different set up totally electronic, it will just have a much hotter fast spark and wont need to be tuned up as often because the plugs will last longer and there will be no points to change. The valve settings are .017 Intake And .021 Exhaust hot which just means warm. And the best way to set them is on compression stroke following the firing order. This is based on factory equipment. If you think the cam has been changed from other than factory just set them at .022 & .022, it wont hurt it's performance, just a little more tick tick tick. Hope this has helped you!