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With the engine running, grab a can of carb cleaner and spray little shots around the intake manifold and carb base. If the idle speeds up, you've found your leak. Take your time. You don't want pools of that stuff on a hot engine.
Another thought, though a bit of a longshot, would be to check your heat riser thingamajoob (if yours is still present). It could be flapping around. I've had it happen before and tracking it down will drive you batty. BTW, I'm talking about the thing that's usually mounted on the driver's side in between the exhaust manifold and the down pipe. If you don't need it, just wire it open or remove it.
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