Are you using new gaskets? If the O-ring stands out more than .012 you will also have trouble. A .010 deep .041 wide receiver will allow the gasket to pinch tighter. Some o-ring jobs are horrible. The fit of the ends is important. Cosmetics will work with job weld or copper o-rings filed flat. As always if the surfaces are not flat nothing will work


Career best 8.02 @ 169 at 3050# and 10" tires small block power.