I have a Performa 580 with a logic board from a 6360 in it among my collection and that worked a charm... certainly the fastest 5xx I have ever driven... the only change required was swapping the port bezels over to suit the 580 case. The board connects the same, however that being said, the 580 is different from the 575 in a number of was including that the 580 uses an IDE hard disk controller, whereas the 575 has a SCSI internal drive. That being said, the chassis both seem similar enough that this could also be possible on a 575 and possibly a CC if given enough PSU and AB to support it... Just a bit more food for thought whilst we are on the topic of more in-depth hacks of the 68k AIO's.