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I have a 77 337G, normally aspirated. When I purchased the plane (used) I took it into a dark hangar and used a flashlight to find every leak between the upper section and the lower section. For small openings I used RTV to seal the openings. There was a larger opening when the cowl flap operating rod goes through the metal baffling. I did some testing in moving the cowl flap doors open and closed, and could see how this rod travels in the opening. We then cut a piece of rubber baffle material and RTV'd it over the hole, with a slit for the rod to travel in its normal course. Additionally, as I recall there was a fairly large gap near the accessory case which was easily filled in with rubber baffling material.
Since then I have never had a cooling issue with the rear engine in flight. The only rear cooling issue I have had is when I have landed at an airport for a full stop and taxi back, and have to wait a long time to take off again. If I know or suspect that is going to happen I open the rear cowl flaps fully during the approach to the airport. This cools things down well enough to buy me a few extra minutes of time on the ground.
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