Roy, I did not go any further than 93 but as far as part numbers- 90 prototype RXL has its own part number, 91 and 92 are identical, 93 has its own part number. I have no idea of the individual curves from each of those years, I know it is available in the old service manuals as I have had it given to me once before. If someone has the ability to scan and post that would be great. I am almost certain that you want to be 90 -93 the newer ones were not of use to what we are doing. If you get this info personally, share it with me as well as I am curious.
Andy
Pro Stock 1000 #10x Falmouth, Maine
2008 NSA Champion
2008 Wahl Cup Winner