Advice Needed - Can't Start Rebuilt 273

Babyblue66 said
I think this was mentioned, but I'd make sure your crank balancer and timing cover are correct. I know the older ones had a different timing cover.
It sounds to me that the timing is off, it should start right up if all was correct.
My 273 popped off with about two crank revolutions after the rebuild. I was very, very thorough in making sure it had timing marks correct, spark, and fuel.
I wouldn't worry so much about the compression readings. The rings need to seat.

Thanks. After all of the checking I have done in trying to diagnose this problem, I am certain that the cover and damper are correct. I was hoping for the quick start-up as well. There is just something strange going on here. It just does not want to run. I am going to look for a second timing mark on the crank gear as Longgone suggested, but it sure doesn't seem like the timing is off anymore.