Wassup Jae!
Yea that slip on was from my 2nd Hawk, my race Hawk. I'm on my 3rd and 4th Hawk too! I am going all out on this one and never plan on selling it, just like my MC28. You can check out my Hawk project at http://rc31.blogspot.com/.
I should create a site for my MC28 too. I'll do it when I have time. I seen you around on the Hawk forums (Speedzilla, etc.) I was always wondering if that was the same Jae I knew. Now I know! You had the yellow Hawk back in the day? Or was it the blue one? And Marc had the yellow? I haven't kept in touch with Marc...
My MC28 is my street bike. I did get back into racing mid 05 and bought a 03 ZX6RR, new leathers etc. And then the track closed at the beginning of 06. I still have my race bike but my friend is planning on buying it from me. My other friend is buying my 88 Hawk so I'm gonna just have 2 street bikes (MC28 and RC31). I wish we had a track though. I really miss racing and don't really care to ride on the street. I will be going to Infineon in late Sept. to do the 4hr endurance race and sprint races.
To keep this thread on topic...It will be way easier to put the 600RR FE on the Hawk as the bearings are the same, it truely is a bolt on affair. Like maxim said, geometry is a concern when doing swaps. I would be more concerned about geometry on a track/race bike than on a street bike.