Hi Rien,
Oops,
I didn't realise this was a long running topic and more or less repeated myself

The 356 is the quietest running cam in my opinion, the larger clearances used with the 334 add noise in my experiences.
Some time ago a friend fitted a 334 to his A10,
I know it had some other problems but it sounded horrible with the 334. It soon got changed back to a 356 that it originally had.
The 334 went into an Ariel Huntmaster (54) and this sounded rattly with 10 and 15? thou clearances,
John