Yep, I would almost bet on you having headers. It sounds exactly like the starter getting too hot...a problem more common on Chevies because of the solenoid being mounted on the starter. Go through and make sure all of the electrical connections are tight and clean. Try to shield the starter from the heat, and maybe replace the solenoid just to be sure.
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66 GT Fastback,fuel injected 5.0, 5-speed, cable clutch, JBA's and duals, 3.40 gears and handling mods...just call me "Doc"
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