that's where things get tricky... the stem height gets interesting. A RRR did with the 318 valves he had special spacers made to correct the swipe of the rocker on the longer valves. I have seen to many split stands and with the spring pressure im looking at will probably have to mill the stock stands off and use billet ones as well as thick "S/S" shafts.
but sure I would be interested if you have them laying around! OAL may be the same but how the retainer sits with the locks and grooves changes alot