454cid
Sooper Pooper
...There's a gap between the water pump and timing chain cover. I dropped the EGR gasket and 1 bolt when I was replacing it once. Had to get new.
Oh, so you're carrying a spare
I found a wrench I didn't know I had dropped once. It was quite some time ago..... I think I found it when I was swapping radiators, it was down near where the transmission coolant lines go into the radiator.
Normally, I'm able to retrieve dropped tools and parts. I start very carefully looking to see where it went, and then very carefully retrieve it, so I don't bump it, or drop it again and make it even worse.