90 degree adapter leak

I tried to run just a filter plate on my car with TTI headers. The filter sat right on the headers for some awesome oil heating. Had to loosen header to change the filter. I run an original '69 340 90 degree adapter now. I put a thin film of black RTV on both sides of block gasket and snug it up. I always use a new Mopar Performance gasket kit that comes with all three gaskets. Not a drop of oil.