I have a spec II and it's OK on the street as long as I don't get caught at really long lights.. King Cobra is about as nasty as I'll go on most 10 spline input shafts...
I got the wife's KC clutch from Billet Depot on Ebay. It was drop shipped from UPR, it's a Valeo King Cobra kit (same as FRPP but without the $40 Ford Racing box). 169 shipped IIRC..