Well, honestly, I would rather use a retro-fit link bar lifter if I could. Not that I'm against using the OEM Iron Duke lifter. It just seems that the retro-fit one has all of that taken care and I don't have to hunt what it looks like or how to connect it etc. I talked to a guy from the Lunati tech line today. He says the lifter bore spacing on the I6 family is the same as a V8 Ford. He helped a friend put a roller cam in a 292 using a link from a their Ford lifters.