What camshaft should I use?

John Martin said

The distributor works fine. I have checked it, the weights are free, the vacuum advance is a new NOS unit, and it has new points, condenser, cap and rotor.

I said above, that the carburetor has been rebuilt, I put a new economizer into the carburetor.

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Well goddammit, SOMETHING ain't right. You can go on and on about how your crap is "right" or "new" or whatever the hell else you want to call it, but if it's getting 10 MPG like you said something is WRONG. You're just gonna have to dig through it like any of the rest of us and find it. There's no magic bullet like you might want to believe, you're just gonna have to find it. With a little more info, we might can help, but YOU are the ultimate power here.