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Oil filter adapter leaking ?, or bad gasket on oil filter, you can try tightening it, remove the oil filter and tighten the nut, i have never had any luck stopping the leak on either the adapter or filter with out changing the gasket/o ring, sorry with the information you supplied I can only guess.
Have a good day.
Disconnect the negative battery cable. Drain the engine oil.
Remove the oil dipstick.
If necessary remove the exhaust pipe crossover.
If equipped with automatic transmission, remove the converter housing pan and the transmission oil cooler line retainer from the bracket.
On 1996-98 models, remove the oil filter and if equipped, the oil filter adapter.
If necessary, remove the starter brace and bolt and swing the starter aside.
Remove the strut rods, if equipped.
Remove the oil pan and discard the gaskets.
Apply a suitable sealant such as GM part number 12346192 or its equivalent to the front cover-to-block joint and to the rear crankshaft seal-to-block joint. Apply the sealant about 1 inch (25mm) in both directions from each of the four corners.
Clean all gasket surfaces and use new gaskets to assemble.
Install new gasket and seals.
Install the oil pan.
On 1988-95 models, tighten the pan bolts to 100 inch lbs. (11 Nm). Tighten the pan nuts to 17 ft. lbs. (23 Nm).
On 1996-98 models, tighten the oil pan nuts and bolts to 18 ft. lbs. (25 Nm).
Install the strut rods, if equipped.
If removed, install starter, starter brace and bolt.
If equipped, install the oil filter adapter.
If removed, install the oil filter.
If equipped with automatic transmission, install the converter housing pan and the transmission oil cooler line retainer to the bracket.
next step is to remove the intake, you are on the right track, worse i ever found was a cracke block, but that was in a 61 t-bird which was repaired with jb weld ten yrs ago and still holding, but the intake gasket sounds right
there may be a filter mounting block that attaches to the engine and has its own gasket - or there may be another oil filter seal that stuck from the last filter replacement.....known as "double gasketed" it will leak
If it is not the suggested gasket that is leaking then it is the oil pressure switch located exactly above the oil filter adapter. The black plastic housing could have developed a crack and oil will ooze downward and drip off the bottom of the adapter. I had this problem and changing the oil pressure switch took care of it.