You don't get 12 volts where? On the dash gauge, on volt meter at the resistor before the coil or at the points and condenser?
Is your distributor grounding good??? If its not grounding you will have no spark! an old car setting for years can lose the ground between the block and the distributor. It may have had a small ground wire at one time!
You need 2 wires to the + side of the coil one from the starter (The very small terminal for ignition) It supplies Juice to the coil as you turn it over and one from the ignition switch to the resistor! You have jumped a wire directly to the coil So you have bypassed that system! Is your battery reading a little over 12v ( a new battery will read a little over 13v) on a meter? If the coil wire is too small a gauge you could have a voltage drop!! Replace the condenser (there is no "going" bad with a condenser) Its either good or its bad(there is no in between). Without a good condenser it will have no spark! Does it have a condenser right on the + coil terminal The 60 chevys came with that it could be bad and grounding out (bleeding some electricity to ground)! Turn the key on and break the points open and closed manually when the points are off the actuating cam, you should see a small spark! if not See if there is voltage there with a test light when the points are open, if there is clean or replace them! If there's not track back through your wiring!