I had this combination and to tell you the truth it works exelent with a bppc with 060 perhapps a bit slower on a 040 one, but remember the PPC does not do ide handling so do not ekspect to see anny difference betwen a blizz1260 and a bppc 060\240 with the ide adapter.
*edit* since the amiga os 3.0 3.1 nor 3.5 and 3.9 have native suport for ppc. The ide handling is pure 68k
cheers adonay