Toby,
Ok so I had a long reply and the machine ate it. First off the most important thing in my book is does the dyno shop dyno Porsche engines? If not they could learn on your motor if you are OK with that, I would not be.
So to your more specific questions, connection to the dyno can be via a clutch disk or a flywheel coupler. It depends on the dyno. Clutch slip is NOT a good thing on the dyno it makes readings go off. If a clutch is used it will always be engaged so no linkage is needed. The dyno will have its own starter so no worries about starters.
Ignition, bring what you run (the whole thing), using a dyno ignition tells you nothing about your ignition. Yes it is best to have it configured for a 12 volt run wire, the dyno will source that to your ignition. As for the 14 pin and or alternator no need for them on a carbed engine. The dyno has a tach.
While on ignition timing is a BIG deal on these motors, approach timing slowly start low and work your way up. The other way around is a problem. I suggest you start well lower than what you think is good. Bring your timing light so you know what IT reads on your motor. Always use your timing light after that we have seen 6 or more degrees difference between lights. FYI a timing error of 2 degrees can kill 20 FT / LB of TQ AND hurt the motor. Timing needs to be set on the fuel you will run period.
Oil system, this is tough as the lines you run on the car may not fit the dyno. You may be better off with the dyno provided gear. An external cooler is recomended, yours or the dyno's I strongly suggest a cleanable filter so you can do a health check early on in the break-in. Oil is your problem and should not call for a corking fee. No synthetic for break-in. A shop that does Porsche motors will likely have all the adapters and lines you will need.
Exhaust, If possible use your entire system less the O2 sensor(s) the dyno should have two or more. Put a bung in both banks, a float level or jet problem on a non monitored side could cost you.
So to bring, a motor that should start, all static checks done. The fuel you plan to run, oil yes lots, a cooler if you are using one. Spark plugs are good to have too, a bad one costs time.
I hope this helps,
Stay Tuned,
PFM
PS If you want a SoCal dyno shop PM me I can help.
