Call John Mihovetz at Accufab in California. (909) 930-1751 He almost certainly has the biggest collection of such parts outside of Ford. The parts you desire are unavailable from Ford?
Has anyone put a 5.8L in an 05-06 GT? Just curious. I know there is the dry sump issue but it wouldn't surprise me if someone engineered one to work somehow.
I thought the 13-14 trinity blocks were almost the same as the GT, having the side piston oilers, and the cross bracing in the valley? The biggest difference was our iron selves, vs the plasma spun coating (and displacement of course).