Actually, I'm looking at an old version of Amiga Format right now. Eyetech sold an uprated 75MHz Apollo 68060 board for the A1200. It worked by piggy-backing a small pcb containing a plcc 68060 w/o fpu kind of like a Quadoubler for the Mac or A3640. The integer unit was fast but alas, no fpu so I don't think they sold many. You had the option of removing the pcb from the mainboard and installing a full 68060.
I did read somewhere that the 68EC060 units may actually have complete mmu and fpu units but that Motorola did not want to guarantee them so they slapped the EC badge on the chips. I believe you can find out if this is one of those by checking the mask revision and serial number.
