The minimum requirements for Classic is that you just should have OS 9.1 or higher as your Classic system folder.
By "blessing", it means booting into OS 9, taking the system and finder file out of the system folder, and putting them back in. Then you can boot back into OS X, and it should be recognized.
I would bet, though, that just a simple update to 9.2 would fix the problem, as it probably updates some of the resources and would rebless the system folder in doing so.