Heads markings

In Pick-n-Pull today. 90 model SC has heads that look barely wet with oil. I remember it had a blower that had failed (someone bought it anyway).

I looked all over the heads and the only markings I see are "Hecho en Mexico".

Where do they stamp the SC on the heads?
What difference could these have if they are non-sc 3.8?

SC should be stamped on the end of the heads, towards the front of the engine block.

Here's a picture

I'm guessing they be standard heads then.

That is probably why it was at the pick-n-pull.....

I've seen this before at our pull-a-part.....