man your stubborn

First fix the hokey soldered oscillator,with socket or another xral(which i'm sending out in the morning

)and stick the 060/50 cpu i left at your house in the board,and let see if the thing will run

i suspect that the cpu has a broken mmu or fpu,or the board was never intended to run 66mhz(thats not the original cpu it came with) or the its the hokey xtal soldering.more than likely the 66mhz overclocking is screwing with the scsi chip.these are all guesses,but easy to eliminate each.
in any case you won't get anywhere until you fix it right. your care package will go out in the morning

oh and i had some oscillator sockets,so im sending one.
mech