65 t bird 390

If you are doing a compression check, anything from 110 to 180 would be good if they are all similar. With 10% or more between two cylinders, you may have a problem. If it hasn't run in several years, it could be as low as 85 and be OK so long as they were all close to the same. In that case, change oil and add Marvel oil to the gas and the crank case and take it for a 200 mile ride and check it again hot.
 
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