Re: 1985 Chevy c60 ramp truck with a 1970 454, early sm465, & 2 speed Rearend????
Finding the higher gears would be the biggest problem. You might try calling a Chevy truck dealer to see if any are available, or if they were ever available.
If nothing works out for you, you could try taller tires, especially if you are running low profile tires now.
Bill
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