comp 979 valve springs, are they internally dampened?

Or meant for external dampening? Or does it matter? Maybe I could pull the internals and use the factory external dampeners? 'Cause 4 out of the 12 I received have internal dampeners and the rest don't.
Sounds like you got some 980's mixed in as well. Make sure that you use the stock cups with the 979's
If it was me, I'd send them back. No way other them putting them on a spring gauge to tell for sure if they are 980's
979 and 980's are made from different steels and the heat treatments are different. Spring rates are of course different. 979's are not internally dampend...980's are.

I agree with sending the whole batch the supplier's expense to get a shipment that you have confidence in.

Regards, Bob