Blue's cylinder head

Brian rang me earlier tonight to tell me that the replacement valve stem oil seals were too big because they foul the inner valve springs so I went over to his place to pick up a couple of the old ones as samples so I can order replacements. I'm going to try one of the local engine building places in the morning as I need Blue back up and running as soon as possible to be able to put it back on the road. The valves needed doing and the head needed decoking which is most likely due to the low mileage (22,600) clocked up from new until the car was laid up in 1993. I consulted the Guru and all he could tell me was that he's never had this problem.