Hey I have an optispark distributor that came out of a wrecked (but still running) firebird. I don't know the mileage on it. It worked when it came out of the car. I can't guarantee it will work since I don't have an LT1 to test it on. Got the cap and rotor with it too but I'd replace those. I'll let it go for $50 if anyone is interested. Pics available upon request. Thanks