Advice Needed - Can't Start Rebuilt 273

Steve and all...OK, built and installed piston stop....balancer marks are bang on. Stops one way @ 10* after, and back the other way...stops @ 10* before.

dot to dot is when #6 is on compression

I've tried the dizzy both ways...0* and 180*....I get nothing when it's 180* out. I've actually set the dizzy using my timing light on #1 plug wire while cranking...and the light flashes at 10* advanced...have tried 0* as well....no change. Turn the dizzy too far ahead and it hits against the starter.