I feel that all head gaskets today are 'lesser' than they were since they removed asbestos from them. I'm not saying that's a bad thing though.
Copper Head Gaskets are great but only when everything else is perfect otherwise, they can be your worst nightmare.
When is it worth upgrading the cylinder head studs to better quality ones?
All the post 1968 Factory Head Studs and Nuts are brilliant and suitable for just about anything. Many of the new replacement Studs are inferior to these, I've had trouble with most of them in the past, so if I have to replace them, I now only use ARP.
One last point on the factory items. There were a few different types over the years and as mentioned, all are very good, however, don't mix and match types as some stretch different to others and while they may all be fitted up the same, a mixed set will produce different and uneven clamping of the head to the block.