WHY DONT YOU TRY IT?
If you have all the materials handy, try it and see if the contact is sufficient. There are many socket 7 heatsinks still being sold by retailers, just check them out. I bet all the socket 7 HSF reviews are gone nowadays, but almost anything will work fine for a socket 7. K6-2's run hot, but they are designed to.
If you really want to lower temps, remove the IHS from the K6-2
