Advice Needed - Can't Start Rebuilt 273

Re-read this, too.
That´s how I do it every time, never fails.

And when the piston is coming up at TDC, put a wire in the sparkplug hole, as the piston is at the top dead center check that the mark on the timingcover align with the mark on the damper. At this moment put the dist in with the rotor pointing at #1 cylinder sparkplug wire, (assuming that the mark on the timingcover align with the damper that is.)
Perform a maintenance on the carb too to check that everything is alright with it (needles, seats and floats)
Hope that all of these advices don´t make it worse, lol.
Just trying to help.