TCH911, a few CA members have aluminum louvers over their decklid. One type covers the entire depressed area of the decklid and resembles a Lambo Miura while the smaller one sits only in the opening. Both work well for shielding rain from hitting the engine and both are removeable for cleaning. They occasionally show up for sale. Next, if you only want to ensure the engine will start while parked in the rain, there are rubber distributor covers available (Ford once sold such things for boats and off-road vehicles). The carb is OK as-is with most solid top air cleaners, unless you have one of those problematic porous filter-tops that will channel water directly into your intake. In a Porsche engine conversion, a friend hydraulic-ed a piston during a rainstorm this way.
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