rear main questions

[diomed]

My engine was making a noise that sounded like a rod knock. I tore it down, and the babbitt rods looked beautiful. Now I'm on the mains and got a couple questions about the rear main.

1. There was only one thin shim, and the clearances with it were .003. I removed the shims and it's right on .001-.0015. Is it OK to have no shims? This engine probably has 1500 miles on it, so I was hoping there would be more adjustment left. I guess if it needs more adjustment later, it'll need babbitt poured.
2. Is there supposed to be a rubber seal at all in the block or cap? The block looks like the seal is made out of babbitt and the cap has nothing in it. It didn't really leak that bad considering there's really nothing there.

This is the first "A" engine I've ever tore into, just want to make sure everything is cool so I'm not doing it again soon. Thanks!