I have a 67 Camaro with a 327 engine. I am having a recurring issue with the engine cutting out and missing at the upper end of the rpm range starting around 3500 rpms. The issue is worse when the engine is cold but will still do it when warm and pushed harder. I have an Accel supercoil on top of a stock electronic ignition type distributor. No other mods. I have checked the rotor and cap for obvious defects but that is a far as I have gone. Any ideas on where to start? Perhaps even where to begin testing for a most probable cause.

Thanks in advance for any ideas you may have.

CT