stumped!

Some things to keep in the back of your mind........

1....Any chance the cam is timed incorrect? We've had guys mistake the markings on an advance / retard multi -keyway cam drive set

2.....We had one guy who ended up mistakenly with a reverse grind marine cam

3......Any chance the valves are open? Does it have compression?

Compression, Spark, and fuel.

Any chance the fuel is stale?