Hi Dano
I would if it was mine, might look ok but, there are some good suppliers of Inter cams out there, but you need to check that the new cams and rockers make good contact so you have the maximum bearing surface to reduce bearing stress etc.
Has the cam box had any work done on it, are bearing bores parallel check with bearing blue on the cams as I said before, I do this with only one of the hairspring spings in place so I don't have the engine being turned over by the cams (so much), when checking, I should probably fit a light coil spring.
Does the inter have adjustable oil supply to the over head cams, if so make sure you are getting the correct amount of flow to the cams, I tee a low pressure, pressure gauge in the feed line and set the pressure between 9 and 10 PSI at 2000 Rev/min (as advised by the old guys).
My 1955 Manx has adjustable oil flow, according to the experts only in 1955 short strokes, Ken McIntosh told me to ditch it as they were no good.
The racers I have spoken to in the past said they never had any problems with cams and followers so there must be something different, oils?
Talking to Jack Caruthers back in the early 70s, he said when Kel was racing the Manx he would stick to the redline and have no trouble with the Manx for a whole season, but if he looked like he was in the money he would often over rev the engine, then a rebuild/check was in order for the top end.
Talk to Ken McIntosh if you can he know more than most about these old Nortons, he has been helped me a lot, in the end they are pretty agricultural really.
Burgs