Depends on the flywheel, check this link out:
http://chev235guy.blogspot.com/search/label/Flywheel%20Timing%20Marks

There are two with balls on the flywheel. One is set at 2 degress after top dead center(retarded), that flywheel came off a blue flame 235, believe 55 and later, the other is more commonly found on 216 engines and is 5 degrees advanced or before top dead center,
The third is straight up.

Link courtesy of Pre 68 Dave

Last edited by sstock; 02/03/2019 1:24 PM.
1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration