I see you have good advice for the 968:
http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/747114-cam-shaft-removal-968-a.html
Here is a little information about the lifters from Bennington Motorsports:
Bennington Motorsports
The only change I make is that to test the lifter/cam follower, press in the button and compare to others.
Hard feel is best--replace "soft", easy to press in lifters
If you need spares, get good used INA lifters---new INA lifters have a failure rate.
Repeating Bennington---lifters go in the same bore they came out of.
Timing Gear? Not enough experience. You already have the main failure part--pads.
GL
J_AZ