1954 Ranch Wagon Parts ID

[51504bat]

Pulled the 239 Y Block and I'm starting to prep for the 302/AOD install and I need some help with a couple of parts(?). First the nut and stud on the upper fire wall below the windshield. It was covered with a glob of what appeared to be strip caulking. Before I crawl under the dash to investigate I thought someone would know what it is/does? Second question, there is what appears to be some type of rubber mount under the radiator but the radiator doesn't rest on it as far as I can tell. Things are much different in this project than the flathead in my '39 p/u so any help is much appreciated. I did look at my chassis manual but came up empty.