i am not an expert by any means on this stuff but, from past experience chevy straight 6 bangers love gasoline. with gas as you said at 3.50 a gallon i have driven and still do drive more fuel efficient V6 hooked to a 5 speed out of a S10 truck. my little s10 truck got mid 20 mpg's all day long. my dailey driver now is a 4 cylinder S10 and it gets low 30 mpg's. chevy's new power plants with the fuel injection seems to help in the fule mileage area. i know big ole real trucks have big motors...but ole real trucks also suck gas bad....maybe it's time to rethink the whole engine thing again...
thanks for listening