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You should do the leakdown test before deciding to tear the motor apart. Do it several times in fact.
A SC is 3.0 liters, not 3.2. A 3.2 Carrera with Motronic would be beyond your budget with just the necessary fuel/ wiring alone.
Fixing the oil leaks are the easiest part of this project. Most likely just oil return tubes and thermostat. You will have to drop the engine to get to the thermostat.
The thing to do is clean the entire engine thoroughly, then run it to see where fresh oil leaks out.
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