Personally I've found the KYB Gas-adjust a bit too firm on the front of both my '67s, IMO the springs being over-controlled and so not reacting to lesser bumps in the road. I don't like a soft car that wallows but I also don't like Mustangs with roller skate like stiff suspension that skips across road surfaces.
So on my present car I swapped over to Gabriels on the front, inexpensive and am happier with them.
On the back I use Monroes, they seem just fine.
Just MO.