m103 post h-gasket job,1st run stahl

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Head gasket replacement,
Began Friday night by draining oil & coolant
Saturday 8am began - Sunday 2am finish
Lots of prep/replacements/cleaning
Sunday 2:15am 1st fire success, idled 40 minutes, noted engine running hot (100+) w/ heater on (90) but all air going to defroster, possible coolant air lock?
Sunday 8am, ready for 25 mile runner/break in. 5miles in she loses power and I coast in, call tow.
Sunday 9:45? where or what did I do wrong.
No fire (spark) No turn on rotor on bump? Suspecting a slip up or break in timing area, will inspect this tomorrow night.

Any ideas? I am always seeming to be 1 step behind on learning things the hard way