I did something similar with a U2W 160 mbps SCSI card and 10k rpm Seagate Cheetah drive circa 2000. I saved up and found an amazing deal on eBay, shipped to the US from Australia. Waited a week, plugged it in, and found out it had no boot ROM. So it worked, but I still had to boot from an IDE disk which ruined my whole vision for the build. I was so disappointed.