Try a new gasket kit. There is the Mopar gasket kit and one from NAPA.
The large diameter circle shaped gasket under the plate is thin and narrow.
NAPA sells neoprene sheet, and you can cut a slightly wider gasket, use gasket cement to attach it to the plate before installing.
Use the thin seal under the head of the bolt, and the thick one on the bolt between the block and the adapter.
Hope this helps.