This topic comes up a lot.

I'm no expert but I'd recommend Rotella T or Delo 400 LE. Both have fairly high levels of zinc to protect a flat tappet cam and are easy to find and not expensive.

I run it, my dad runs it, many here run this diesel oil no problems.

I personally think race oil would be money out the window for your engine. It sounds fairly mild. Even fairly wild engines are getting by with cheap diesel oil.