It's not the road race pan. It's one of Milidon's extra capacity LA oil pans for a 360. They fit on Magnum blocks, but you have to use the 4 piece pan gasket set unless you modify the pan to flatten the notches at the timing cover/ oil pan rail.
I made the mistake of using the one piece Magnum oil pan gasket, without hammering the notches flat. The flaps on that gasket blocked the view of the big gap that was left at both notches, so I couldn't see the opening it left. Oil was spraying out everywhere from those gaps until I finally figured it out.
I hammered mine down and used a Magnum one-piece gasket with a bit of extra Permatex Ultra seal on all four corners of the front and rear transitions.
You can see the dimple I made so the main studs didn't hold the pan off the sealing surface in the pan photo.
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