I think I used some POR-15 patch for a floor one time. Worked well but was a little expensive as are all their products. Fills in areas like that well.
I like that back board you have. How did you make that? I had planned to use thick cardboard and cover it but looks like you used something much sturdier.
Several years ago I bought a 72 Camaro. Had some kind of sensor under the body and something on the drive shaft that triggered it every rotation. Found out it was some kind of aftermarket cruise control apparatus. I think someone told me they came from Sears when I posted pics of it on NastyZ28...
Pretty sharp. I would assume it has a Q-jet on it now if original. If so my suggestion would be to have it rebuilt if that is indeed what it actually needs.