In my workshop manual
(1956-1962) it shows a very detailed description of the valve timing for both engines.
My bike has the wagon wheel stamped version which has the softer cams.
According to the manual
, intake valve timing is also retarded by one tooth
is #99-0837 and I must say it is well worth whatever you need to pay for it
I believe Kim the CD Man, has it available on this site
I think the main question would be which cams do you have
Does your engine number have the wagon wheel? Has it been stamped over to denote a cam change?