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1991 964 re-seal vs. top end rebuild

Engine

Vehicle Information: Year: 1991; Body Type: Cabriolet; Total Mileage: 64,000;

My car sat for most of last year due to illness. There are no oil spots on the garage floor, no smoke from the engine. I'm not sure what the oil consumption is since the car has not been driven for 6 months. Now I'm being hit for a complete re-seal due to oil leaks (about $6500) plus a "transmission seap/leak" repair at about $500. I have a few questions to help evaluate my options. I intend to autocross the car this year.1. What is the risk to the engine if I don't have the re-seal work done, as long as I keep an eye on the oil level? 2. I see that top-end rebuilds are being done on this model at 70,000 miles, so does it make sense to have that done at the same time, since the engine is out of the car? 3. What can I expect the cost to be for a top-end rebuild and should the cost include the re-seal?

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