I had a 462 6X8 ported, 041 cam, 9.3 compression, Cliffs Quadrajet. I was happy to get 10 I usually got 8.. I wouldn't expect to get any kind of decent gas mileage out of a ported motor with a long duration, wide over lap camshaft..
160 is kind of cold, maybe try a 180 thermostat..
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