You absolutely need a timing light. This is mandatory, not "kinda would be maybe sorta nice". Go get one.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Well, I'm not sure if that mark is still visible on the crank pulley, but I'll check later.
Today I got to work at my part-time retail job at O'Reilly Auto Parts. I'll take advantage of my employee discount to get a timing light soon.
Yeah, you're right. I know that I need to get a timing light.

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"Ja, Ich fahre ein altes auto."
'78 Volare 225
'67 Charger 318

Check ebay too. You can probably get a higher quality timing light for the same price as your employee discount. I got an entire Sears engine analyzer kit from the 80's on there once with the engine analyzer, compression gauge, timing light and remote starter for $35 total. The whole kit looked brand spanking new as well. The only thing I wish it had was a dial back timing light.