The timing pin should be in the LH hole. This clearly shown fig B86 on page B49 of the 1970 manual
.and in figure B85 on page B53 of the 1971 manual
. The Rh position was for Energy transfer models.
Doesnt matter at this stage,
The haynes manual
is better than nothing, especially if you need to cover different years.
Try to get a year specific factory manual
, available on E bay, this will be much more detailed.
Attaching pictures is a test, if you cant figure it out, you shouldnt be working on the engine.
Take pic on digital camera, upload to a host site like Imageshack ( dont use photobucket) , from the host site you get a URL that can be used to post a pic in the thread. Its very clunky.Images must be below a certain file size, dont go Giga pixel.
Or pay Morgan the ransom/ membership fee and you can skip the host site part. This is why Farcebook BSA pages are thriving.The trouble with FB is stuff moves fast and there is a huge amount of duff gen, this site is a bit more fixed and bad info is less common, it still pays dividends to RTFM.
There should be a manual
timing plug in the front lower RHS of the crankcase, remove the plug, turn engine until a detent slot in the flywheel allow a 3/16 diam rod to engage, there is a factory tool, but an allen key shank will be close enough, the slot is at the full timing advance position so the advance retard mech needs to be wound round against its spring tension.