New to HAMB

Hi, I am from Tumby Bay in South Australia. I am building a 32 Tudor with a 350 Chev.
Just wondering if anyone knows what the small hole on the top of the block near the dizzy is? Has a red plastic plug in it. It is a new crate motor. I'll try to post a pic.

 

Port for oil pressure sender.

 

Pencil holder.

 

Thanks, I thought that may be. Been 40 years since my Rod building days and had Ford motors then. A lot easier building these days, so much available off the shelf!

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