Avgas won't do anything to clear out the carbon build-up. On a very high-compression street rod, putting Avgas in can give you better performance for that tank, and maybe if you drive the snot out of it for that tank it might burn off some carbon, but that's an indirect benefit at best.
Your truck will probably have less detonation for that one tank, because of the high octane, but there won't be any lasting changes. It won't burn off the carbon unless you drive with your foot to the floor for a whole tankful.
Plus, Avgas is usually leaded, and that will hose your O2 sensors AND your cats. Probably not in a tank or two, but it will eventually.
I'm considering trying the Sea Foam in the intake manifold trick, but I don't think I have bad carbon fouling, so it would just be preventative for me.
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95 Classic SWB
If it's not leaking, it's empty.
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