Setting timing on a 225??

To add to Bruces comment, you can get a Harbor Junk 7/16" wrench and apply heat and bend it so it fits around and under the distributor. Be sure to accommodate for the trigger wires so they don't hit the wrench as you tighten or loosen the distributor. Crafty individuals can weld a long extension (again, Harbor Junk) on the end of the wrench.