Jack,
I know you know this stuff, just giving encouragement, Compression, fuel and spark are the three things to get that motor running.
1. It ran last time, so likely safe that compression is still good. But some things that could be hurting here. (Timing chain, slow cranking)
2. It’s getting fuel? You checked at the carb, tank has gas, gauge working.
3. Spark, pull a plug wire and check for a good spark to ground while cranking, either with a spark tester or a spark plug attached and grounded.
Good luck