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Re: Loss of power after RP swap
What you haven't posted up is what RPM range are you at when you have to downshift while going up the hill. Sweet spot for the inline 6 engines are around 2100 RPM. Below that, they don't have a lot of power and with the 3.08 gears, you're likely falling off the power band.
Also keep in mind, even bone stock new, these engines are only putting about 120 HP to the ground. An old, higher mileage one is likely luck to be at 100 HP. That's not much given the truck weight and brick aerodynamics.
Don't be afraid of spinning it up a little. My '64 Chevy II wagon, at 70mph, is at 3300 RPM's. You might need to downshift into 2nd and leave it there until you crest the top of the hill.
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