Wont Start, Help

Juz sayin, but putting in a chain as you describe is "no way." Because it assumes too many things.......like the old one and the distributor were correct. Even if it ran this does not mean things are correct

"Checking spark." Just how did you do that? EG: If you check spark by jumpering the starter relay, and then try to fire the engine using the KEY this sets up two completely different electrical scenarios

Please describe how you checked the spark, IE just how.

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When you jumper the start relay with the key in "run" this only gives you minimal voltage to the coil as it is through the ballast resistor, and the bypass circuit is not active. So you will have a weaker spark compared to..........

when a properly operating system is cranked using the key. The switch has a resistor bypass circuit (the brown IGN1) so you get a hotter spark in "cranking."

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To check spark, "rig" a solid core wire from the coil tower to a wide gapped plug or better yet a parts store spark checker. Crank USING THE KEY. You should get a nice fat spark 3/8" or longer nice and blue

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FUEL Has it been sitting? Are you priming down the carb throat with some KNOWN fresh fuel?