How much would the mod cost, and is it a full 060?
EDIT: or do you do the PPC side only?
The days where 70+ MHz '060's were all EC varieties only have passed, really. The E71J mask has been around for quite a while now. That'll happily do 100MHz with the right cooling, though getting the rest of the card up to those sorts of speeds would be a big problem, I expect.
