Cylinder head identification - Chevy V8 - K706121?

Hello, I have an 65 Impala which has had an engine replaced. None of the numbers on the heads check out as being a GM product, they have a number on the side of the left hand head looking from the front of the car.
It has a K, then another K but horizontal then the numbers 706121.

Anyone know if this is an after market head as there are no markings under the rocker cover where they would normally be

Answers:
Well, I don't know either cause I tried a quick search myself. You may want to hit something like a Summit catalogue, or even call them, and see if thay can match the numbers up. I'm sure they're sitting in front of a computer screen and have a program that will just jump straight to the part for whatever number you give them. They may even have some suggestions to help you further along, if they don't know themselves.
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