Well Bruce... you can make your own marks on the flywheel.
First use a screwdriver in the spark plug hole... and get the piston at the top.
make a nice straight clear mark anywhere in plain sight on the flywheel.
Then... attach a wire coathanger under a bolt head somewhere near there.
Then... while the piston is at TDC... bend the coathanger till it lines up with the mark you made.
Next... measure your flywheel diameter... then tell me what it is... then I will give you a dimension to make another mark a set distance from the first one.
THEN... use an electrical meter and determine WHEN the points break... adjust the point gap till the points break when the second mark is lining up with the coathanger.
Also... if your points are mounted to a removable plate that is screwed to the motor (under the flywheel)... then it might be possible to slot those screw holes (if they are not already)... and rotate that plate to help you set the timing... (instead of relying on the point gap to set the timing).