Thinking of getting away from the 64 gmc.

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So am i just being dumb or just thinking to much??? A buddy of mine has a 68 chevy c20 396/400'big back window, a/c cab long bed, and power brakes that is all original runs and drives. I dont like the fact that its a c20 but he does have a c10 frame in the yard. Not sure why i've been thinking about this but i know i could sell the 64 gmc and buy the 68 chevy for a good price swap out sup or frame do the brakes. fuel tank and have less in the 68 then what i could get out of the 64. So am i a dumbass for wanting to or not?

I love the gmc and ive done a lot to it to make it what i want but ive always had a soft spot for the 67-68 chevy. A 72 is what i learned to drive in. hell maybe im just thinking out oud here??