Bought a new car this morning

Yeah, engine is tight. Ran 70 plus, performed very nicely. Starts well, runs well, until it does not start lol. The line is moved away from the engine in front of the carb. Stock fuel line, stock mechanical fuel pump. On these no starts it was after a highway run and car cooled off, last time it stalled it did not sit too long but it was like 27 degrees. Running on the highway no hint anything was wrong. Thought this Fireball Coil would have a strong spark, seemed like a stock coil kind of spark when I got zapped. Just clueless right now?