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Welcome, Det.
Your VIN indicates it is a 1970 Cutlass Supreme convertible built in Lansing, Michigan.
That number block was used from 1968 through 1976. Is the "F" plain or is it serif (a little "foot" on the bottom)? Are you sure it's not an "Fa"?
Those are "smog" heads used 1973 through 1976. The chambers are 80 or 82 cc and the exhaust pockets are restrictive. But if you find somebody that REALLY knows what they are doing, they can be dramatically improved.
C.J.
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