Originally Posted by Leoman
I have a lot of overlap, no idea about reversion
In a very dark area, remove the air cleaner and fire the motor. Shine a very strong flashlight across the top of the carb. The standoff you see as a fog lurking around the top of the carb is standoff (reversion) caused by the long cam timing. The piston coming up the bore with the intake valve still open will push the mixture back up the intake tract and you can see it this way.