[Shelboss]

That is a jag xke torsion suspension and the frame from what I can see is a Contemporary. The block looks like a 427 side oiler service block. They put those ribs in the castings to strengthen an area that became weak as the tools aged. To my knowledge, all 427's were high nickel content with a square profile cylinder wall to compensate for how thin the FE block gets when overbored for 427 cu in.