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In alot of newer cars they put a cat under the hood as part of the exhaust manifold.
If you had a shorty header and attached the cat right to it this may help get the temp up in the cat getting to the light off temp easier.
If the header is thermal coated and wrapped...this will help to keep more heat in the manifold it self.
Then do some research to find a cat that starts working at a lower temp.
I'd maybe go for a smaller car like a nova, or fairlane.
They are alot lighter, had a straight 6 available, and I have read plenty about people changing the rear gears and averaging upper 20's to lower 30's for hwy MPG's
I think you could get one of these cars even with a carb to pass modern emissions testing.
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