cpu.h and Color Classic/LC 575

I am attempting to run OpenBSD/mac68k 3.9 on a Color Classic that has  
been upgraded with an LC 575 motherboard and full 68040 but without  
the 640x480 video hack. In order to run Mac OS 7.5.5, I had to change  
an item in the System file for the Gestalt ID 99 from Boot Process 21  
to 10. I get the same bus error in OpenBSD/mac68k that I got with  
System 7.5.5 before being patched (it looks different but the error  
is the same). Any idea if modifying sys/arch/mac68k/include/cpu.h to  
read Gestalt 99 instead of 92 for the LC 575 would have any effect? I  
would just try it and rebuild the kernel but that takes a very long  
time so I thought I would ask first before I try it.

Bryan