76 corvette will crank but not fire. Items replaced in distributor, cap, rotor, coil, module and capacator. car would fire each time new dist. part installed. 2 days of not being driven the car would not fire again. new ignition switch yesterday, no fire. carb is newly rebuilt and getting fuel. new plugs last year, no catalytical converter and new exhaust. new battery and holds charge. Alternator tested when it ran and checked out fine. Spark is not white, it's orange. lost lost lost, please help