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The early square tooth belts are a bit easier to jump. Age does effect the belt but probably much less so when not exposed to heat and fluids as it would in the car. it would probably be OK, I'd still buy a new one. If your motor is definitely non interference there would be very limited risk using it. What's more important is finding out what is causing the grove. My guess is the bushings in the tensioner arm are worn causing the idler pulley to cock.
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