Sorry I’ve taken so long to get back to you, but I’ve been out of the shop at zoning board hearings, which are worse than watching paint dry……
OK, you have it at TDC, and you think the chains are back where they belong. The OEM manual “cam allocation procedure” (Porsche speak for setting the cam timing) is an overly complicated fourteen page affair that assumes you have totally disassembled the engine, so it really does not apply to your case.
I would start by pulling the two green cam plugs on both ends of the engine, so that you can see the slots in the ends of the cams:
Assuming you have the cam holding tools provided by LN, you should be able to see if they fit into the slots in the ends of the cams:
If the cam retaining tool does drop into the slots without any force, you are probably as close to being in time as you going to get without really getting complicated:
Be sure to replace the green plugs with new ones, do not reuse the old ones or put any sealer on the new ones.