For better or worse, what I'm trying on mine is a SS plate cut to fit in the left side intake gasket cross over spot (68 intake) and leaving the right side open so that the divorced choke gets some heat.
In mid-68 they did away with the flapper valve on the exhaust manifold that forced exhaust through the intake, and instead went with the thermostatic controlled valve on the air cleaner snorkel to an air pre-heater on the left side exhaust manifold....which I will have installed. Since I'll never be driving the car in the winter, I'm thinking this will get things warm enough in a reasonable amount of time.
After they removed the flapper valve in 68 ... I guess the engineers just figured natural exhaust turbulence, or pressure mis-match between exhaust manifolds would move enough exhaust through the intake.
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