Natomi sounds kind of neat, but wouldn't a compatible OS on a say a G4 or some-such be better? Anyway, 68060 is faster than any classic Amiga.
Measuring performance is always tricky since you have the graphics co-processors to take into account, plus blitter, etc.
A base 68000 at 8Mhz is 1 Mip compared to 110 Mips for 68060 75Mhz.
But the original Amiga 1000 had graphics co-processors that could push pixels faster than the 68K could. So what is performance?
