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I agree completely with combining the IMS with the clutch. If the car has made it close to 100k then you have the luxury of being more opportunistic in your timing.
I have many high mileage engines in my collection. I have 240k on a 94 chevy truck, 214k on a 93 Range Rover and 97k on the Boxster. I consider the Boxster to be the "fresh" engine.
I guess you could say that I value what I buy and take care of it.
I see the high mileage in the Boxster as an opportunity to upgrade the motor when it does meet its demise. But realistically the priorities change when you are approaching the end of the service life.
I did a valve job on a V8 with 168k on it. The bottom end was strong, oil pressure was good, the engine had not been overheated. It made sense.
I have also pulled and replaced motors with a lot fewer miles.
It is a judgement call.
With the Porsche, I think my schekles are better spent on a nice 3.6L that I can blueprint and do the IMS upgrade on the new motor than putting it into the older motor.
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