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318 Maggie. When I bought my 92 D150 new it got 26MPG imperial (20 US). all stock 318 magnum, 518, 3.55 gears, no aerodynamics. So I think the smaller cubes in the light and slippery Challenger is the way to go, that and a Thermoquad carb, I'd keep the MSD but maybe keep a spare, known Mopar ECU from pick a part beside it.
BTW, I've thought about a 273 Magnum as well, it could be a cool way to go, especially if you lighten the Challenger a bit.

Sheldon




Yeah... too bad there are no roller block 273's...

I'm thinking a 318 or 360 Magnum with an RPM intake, small but very modified Holley (sorry, not a Thermoquad guy...), work ov art exhaust system, 5-speed (does Keisler actually sell that T45 kit yet...???), some 2.97 or 3.23 gears in a lowered 3000lb car could be pretty damn fun. It would HAVE to get better mileage than my bone stock 78 360/727/highway-geared Volare too.