Nope, they're all good engines. The GMC 305 will pull stumps, and it has trouble passing a gas station, but the rear end ratio, not the basic engine is most likely to cause the really bad fuel mileage. It's not altogether the engine's fault.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!