wrong engine in '61 T-bird

I have the wrong engine in my 1961 T-bird. I'm wondering if there is a website or someone who could decode the engine tag I found near the distributor.
390 69 11
8 J K 311 S

It has a 2-barrel carb on it, so I'm trying to be as optimistic as possible.

Thanks,

Britt
Palmyra, WI