[6pack] Oil leak around blanking plate

[jrhauser at sea-dog.net]

Anyone have some good ideas on how I can make a good seal around the blanking plate that was installed where my former mechanical fuel pump was?   I've got about 1500 miles on newly restored, tight engine and have sprung a leak. 

I've located someone who has better quality/thicker blanking plates, but is out of stock.  

Thoughts on a good seal until I can get a thicker plate?

Thanks in advance!
John