I’ve had numerous sets of Stealth heads come through the shop over the years, ever since they were first available.
The only difference in parts included on them that Ive noticed since the beginning is the locks(keepers).
It’s been quite a few years now that they have come with the heat treated stamped locks(green colored).

For several years getting them with Comp retainers and 10* locks was an additional cost option.

One thing I did notice, appearance wise, on the last 3 sets I had come thru the shop was they are no longer black oxide coating the retainers and spring cups. They are now natural steel colored.
They don’t look any different other than the color.

A set I had here a few months ago had a little machining issue.
The holes in the casting for the pushrods are machined from both the bottom and the top.
This one set had the part of the operation that’s done from the top...... not finished.