I have probably the fastest CSPPC board over the world. (604/400MHz with 060/66MHz). Believe me it's really fast. Enough fast for use every day 
For example, CPU 68k&PPC speed test by SysSpeed:
For 68060/66MHz:
MIPS - 86.53
MFLOPS - 32.62
For PPC 604e/400MHz:
MIPS - 581.89
MFLOPS - 400.01
UW-SCSI SCA 36GB with SFS:
CreateFile 22.59 MB/s
WriteFile 28.45 MB/s
ReadFile 24.98 MB/s
RawRead 28.74 MB/s
Looks very nice isn't it?
So I think the new OS4.1 for my classic Amiga will run on it smooth enough 
you may possibly hold the record for CPU power on classic PPC but my Blizzard PPC holds the world record for GFX perfomance when comparing Bvision vs Cybervision.
im not even going to bother uploading test results as i already know you don`t stand a chance.