Fearie Looks like an early A7 Longstroke Cam. Two part numbers for this, 67-690 and later, 67 695. Original parts have the number stamped on the end. The Longstroke motor looks similar to the later engine, but there are differences, camshaft is one of them.
Longstroke cam is 178mm long, 334 cam measures 186mm. Both shafts are the same, to the shoulder, the difference is that the longstroke cams are narrower.
Where on earth did you get it?
For later camshafts BSA did not change the numbers, they just added different cam profiles.
67-334 Standard cam, suited to low compression engines, a good all round performer. The camshaft on the basic A7 A10 machines.
67 356 A more sporting performance, Star Twin, Rocket etc, good with flat top and higher compression pistons. Not such a smooth ride, unless you're lucky.
67 357 Fitted to Spitfire Scrambler, Super Rocket, Rocket Gold Star. A truly lively performer.
Swarfy.