oil leak help

The gaskets shown in the link go between the engine block and the baseplate.
You will probably want to double up the hole count in that plate. If your oil-pressure is too high, it can blow the filter off the plate, or the plate off the block. I put two plates each with 8holes, synchronized, on my 360, and problem was solved. Prior to this I had ported the pump, the rear maincap,and the block.I run a hi-volume pump.I had to switch away from a 15W40 oil. I run 10W30 mostly. No more leaks there. As the engine ages (now has 100,000plus miles) I have been returning to 10W40, and occasionally 15W40. So far,so good.