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It sounds to me like your starter is becoming heat soaked and needs to be replaced. You don't [i]need[i] a high-torques starter, a replacement will do, but I am happy that I put a high-torque starter on my '70. Starters would only last a couple years and it seemed like I was alway replacing them. I replaced it with a high-torque starter from Ames Performance Products and have no problems since - but not cheap, listing at $209. I believe the high-torque starter's smaller size helps it get more cooling air and it is not as close to the headers as the original starter.
As a qualifiers:
1. I must admit that since the car is not a daily driver anymore the starter doesn't get anywhere near the exercise that it has in past years.
2. I also have a '66 with an ancient stock starter, 12 to 1 pistons, and headers which spins the engine way faster than the high-torque starter and have never had a heat-soak problem with it.
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