Inliners International Forums General Discussion Engines 261 valve train geometry questions-HELP LOL

The first thing I would look at is if it stops in the same position rotated either way, and if there is more than 1 stopping point.
It could be as simple as a rag left somewhere, a screw between the cam gears, etc.
If inconclusive, back off all the rockers as far as possible to remove lash and coil bind as variables.