Factory bell housing bolts?

Here is a picture of the bell housing with a couple of possible bolts that I came up with in my collection of hardware. Just so everyone knows what I'm trying to do, is to put the engine and tranny back together using as much of the original factory fasteners as I can. The car was partially taken apart 40+ years ago and has been sitting since. I'm trying to put it back on the road and keep it as original as I can.

100_4241.JPG