Maybe use a small trans cooler under plenum. Block the bottom of cooler with sheetmetal and the heat will rise. You could also use a heated air intake with the vacuum/temp control on the snorkel that everyone throws away.
Here's a pic of a dual plane Magnum M1. You can see the water channel that runs from the thermostat area back to the plenum floor. MP does not make this intake any longer.
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