The factory struts do not attach to the radiator support and there is no "swivel type rod". They attach directly to the lower control arm and the k-frame.
Let us know how that windage tray/gasket seals on start up. I bought that same thing for my 440 to use with my 6 qt pan and it looked liked those rubber "ribs" were going to line up with the edge of some of those indentations in the pan so I didn't install it. Afraid that I wasn't going to get...