RG, The 366 is the 427 little brother. Just slightly smaller. It is a "Big Block" Has nothing in common with the 454 or the new 6.0L.!!!! A 366 with a 5 speed and a 2 speed rear axle is truly a Bullet Proof set up and just about unstoppable.This trans & 2 speed set up is commonly call the "Working 4th & 5th" I have personally carried 42,000 of dry wheat on a C65 tandem w/ a 20 ft Midwest bed with 18 in high risers!!! The truck stood naked at 17,000 lbs I have come across the scales at 54,55,56 Thousand lbs!!!!!!!!!!!!!!!!!!!!! Like some of the others have said, Keep the oil changed, oil the 2 speed unit on the axle. It is electrically operated It shouldn't blow fuses. disconnect the 2 speed unit and try it, that should narrow it down a bunch. The 366 will run with most 427s just not use as much fuel!. The Holley carb can cause some problems of No Power, if the Power Valve are blown! In the panhandle where I ran the one I talked about 56K was a hell-uva load about 50/55mph was top with that kind of a load! When all is in order the Governor kicks in at 72 MPH. Hold you Rt foot hard on the floor let the governor kick in, then, Let the engine breath ever so slightly, and put the pedal back on the floor and leave it, and away it will go. Ours would run 80 mph All Out or slightly better empty coming home from the elevator. Hope this helps. Later, John A.
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