Since there are signs of intermittent spark, could it possibly be a bad ground someplace? Possibly the starter is drawing all of the current and there is not enough for the coil?
Phil Moderator, The Engine Shop, Interiors and Project Journals
1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes Project Journals Stovebolt Gallery Forum
