Keep looking for a lower mileage Z, say between 40,000 and 60,000 miles. They're still out there! You're going to pay a premium for the car, but in all likelihood, it will be in better shape than a Z with 160K on the odometer. The premium you pay for a low mileage Z will be the trade-off for you 'budgeting' for a new engine 'cause it craps out on you......G