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The old pushrod GM engines were great on gas. And usually very reliable too. Thats all I have in my fleet. The 4 speed auto does have quite a drop into OD, but the 3.1 has the torque to overcome that. Stroking the 2.8 into a 3.1 was one of the best things they ever did.
Hopefully you should be able to get quite a bit more out of that Buick.
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Winter daily driver, parked most days right now
Summer daily driver
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