Used GM oil filter boss.  This bolts to your engine block and uses a 13/16-16 thread oil filter (common SBC/BBC Chevy).  This will fit 305/350/400 Small Block Chevy and 396/427/454 Big Block Chevy engines.  This will also fit 92-97 LT1 engines without the oil cooler (or removing the oil cooler).  Fits the following:

67-92 Camaro 305/350/396 V8
77-92 Firebird/Trans Am w/ 305/350 Chevrolet engine

The item in the photo is the exact item being sold.