I have the ATP flange (JGS is just a rebadged ATP part I think) for a GT turbo. It has slotted bolt holes for both narrow and wide patterns. The flange is tapped for 1/2NPT of which I have a 45* and straight, both to 5/8" barb. The return on the block is 5/8" also, and I have some 5/8" oil-rated hose around here, too. Have T28 gasket as well.