My 1967 Restoration Project *many pictures*

Hey guys, new here. I'm Hank, 18, and just bought a 1967 Barracuda. My girlfriend and I have split the project. We picked up the car this Saturday. It doesn't have the original 273 in it, the guy put in a 383 and has a Holley intake and carb and MSD ignition. She's kind of rough, but I'm really happy. We got it for $1,500.

And here's the pictures (warning, there are a lot).










With these pictures, I didn't have time to crawl under the car so I just reached under there and took what I could:















On the back of an aluminum part with the fish on it, I pulled this number:
2839108 AN NO 50-541, does that mean anything?

On the steering column I pulled this number:
AP42, does that mean anything?