Big Block/4 row shroud (73-80)

[eric8]

I finally decided to swap my small radiator in my 77C 10 for the big block radiator. I have the new metal top plate and the wider mount cushions, as well as the BB fan shroud.

My questions are about the mounting of the shroud. The bottom of my original small block shroud lid into some U-shaped metal clips on the bottom core support, and then the top of it bolted to the radiator top plate. As you can see in the photo of the big block shroud, it has several mounting holes along the bottom of it, and I don’t know what they are used for? The factory illustrated parts book seems to be no help.