Hey, My car is sort of similarily specced I built it for corner carving also and I just took it on a long road trip through the mountains best I got was 19mpg. It's got a 455, t-10 4spd 3:08 gears,fairly mild cam (forget specs) holley street avenger 770cfm carb, 1969 stock intake, and slightly built/ported 4x heads that have been milled 0.40 The gas prices just about killed me on this trip but I can't bear to park it (It's just too fun to drive). Next year it's getting fuel injection and a TKO 500, That should bump it up to the mid 20's I hope. Heres a pic taken in British Columbia
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