Got a on and off problem which seems to be in the electric system. With headlights on, heater fan on high & radio on, (with "full throttle")engine starts to "sputter". By turning off the radio or fan the problem seems to vanish.This is a 327/300 factory A/C 4 speed coupe.The following items are NEW: 61 amp. alternator.(John Pirkle / Masters City Classic Car Parts),spark plug wires (dated), Breakerless "SE" Electronoic Ignition and engine main wire harness all from Lectric Limited,Inc.,Coil,spark plugs,Dist.cap and Holley Carb(3367) N.O.S......Any Ideas????