What's Missing? C-4 tranny

this is a fun game, WHAT AM I MISSING? Lets meet our first challenge. this is a pic of the bottom of a 1968 coupe with a 289 and a C-4 tranny.
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I thought it was this, but I'm sure its there.
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So what am i missing here/ Winner gets a cookie :D
 

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Mine was missing when I bought the car.

Chevy's Turbo 350's is just open to the air on the bottom.

The biggest reason to install the inspection cover is because it is enclosed on the bottom side. I dont recall seeing any drain holes. Even if there are drainholes the potential for gravel and what not to get inside is still there.

I've never bothered to get a replacement.