I am assuming that the slipped teeth was the reason you replaced the head and hasn't happened since. Check all the electrical connectors. I had a similar issue after replacing an engine and all it turned out to be was that the RPM/crank sensor connection wasn't quite plugged in just behind the oil filter on my ALH. Plugged it in and it fired right up. Also, if it is the ALH in your profile, check that the wire going to your injection pump is functional as without it the engine will crank but no fuel.
Finally got it going today!
The timing was a bugger to set and it turned out that 1 of the 3 was the injection pump timing was off as I was using the recessed portion next to the perfectly round hole that was the tdc setting! All day using the wrong tdc, until I noticed the round hole and remembered a post saying that a round drill bit 15/64” fit perfectly.
Camshaft lobes at the 10/2 am/pm position facing up and the tdc on the flywheel were the other 2 settings.
Feels good hearing it run again, starting to wonder if it would ever run again.
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