Rebuilt engine initial fiasco

When we fired Jake's 65 up for the 1st time with the 360/408, the filter adapter leaked as bad as your's did. Maybe worse. We used the 90* adapter from the 273. Had the gaskets in correctly. Discovered the center terms of the adapter was bottomed out on the center where the bolt goes thru and would not allow it to seal the outer gasket. Took it all off and realized with the magnum manifolds, we don't need the adapter. That was 2 summers ago and about 4k miles. No issues.