You can buy a sheet of gasket material of your preferance, use the plate as a template, and make a custom gasket for this,..... problem solved,...permanently.
http://www.summitracing.com/parts/fel-3060/overview/
Shocked nobody has suggested this yet, flimsy stamped plate like that with low torque needs some material for give and to fill the gaps,....thats why you guys are having repeated issues with just sealant......no bueno.