Check your point gap, and/or the point contacts for being dirty or burned. The point rubbing block has a bad habit or wearing, which closes up the gap. That retards the timing, and also messes up the coil saturation and condenser discharge. If the ignition checks out OK, try a fuel pump volume test. You could have a clogged fuel filter or a restricted outlet in the fuel tank causing fuel starvation. Check ignition first, then fuel.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!