Want my engine to start for Christmas

Gentleman and Ladies, heres my issue new cam, installed, new carb 340 engine, Ive got fire at the plugs, but im not getting any backfire thru carb,no signs its firing,yet i can see it fire, at plug,i had noticed some burns on the top of the cap at the coil wire so i replaced cap, rotor and coil wire, i also checked the wires by rotating them each forward on the cap and back one having repositioned the them 3 times , moved it 180 degrees, same story. No sign of firing off a cylinder