An old mate of mine had a micronik tower / Z3 board such as yours. He slammed a CyberStorm MKIII 060 in there and it was pretty damn fast :-)
The SCSI on board was fine, but naturally he ended up using the one on his CS.
Hey, Rip Van - if you ever read this, why aren't you a member dude?
/remids self - must get in touch with the guy...