[vntgspd]

My opinion may be biased because I am just finishing a complete overhaul of my engine...

If you are going to split the case, you MUST get it checked out by a competent Porsche machine shop. Also, regardless of wear, I would have the crank serviced and replace all of the main and rod bearings. The rods should be checked and resized if necessary. Also check the intermediate shaft and sprockets as I think these items rarely get replaced and thus may have more miles that you think.

There is just so much labor involved in tearing the engine down and splitting the case that not addressing these relatively inexpensive items my come back to haunt you later.

Along the same logic, I would replace the chains, however I would agree with teh posters above that they are probably fine. If they later stretch and must be replaced, you can do this easily without pulling the heads or anything.

Good Luck!