In Reply to: '51 *N starting problem posted by Rich on December 01, 2020 at 07:47:34:
A 51 would have the side mount distributor
Did you lose the spring clip that goes on end of distributor shaft and inserts into the rotor?
Did you get the plug wires in the right order?
Do you have good quality points and are they properly gapped at .025?
Coil is probably not your problem