8N now won't start

Just because you have spark doesn't mean you have proper spark. Are you sure you got those plug wires that you replaced back in the proper firing order (1-2-4-3)? If spark ain't nice whitiesh/blue, it's too weak. Check point gap/condition first. Check cap and rotor for carbon. Check each plug for fouling and reset gaps. Sparks can be easily tested with a spare plug set at proper gap. Just pull #2 or 3 wires and attach to spare plug. Ground plug to bare metal on engine and crank engine (neutral).

Sincher getting good fuel flow to carb and everything had been running just fine, DON'T touch the carb (yet). Check the fuel screen in the fuel line-to-carb-elbow for blockage. If none, spray a little WD40 or ether in each cylinder and crank her over. If starts right up and runs for a coupla seconds then carb is crudded up. REALIZE though that this test works only if you KNOW you have whitiesh/blue sparks. Even poor spark will detonante WD40/ether and give you the false impression that you have a fuel problem.