10 psi
oil pressure is way too risky. Get the 3 qt. accusump if you can fit it in. Cheap insurance compared to a blown engine. Stickier tires mean even more risk of
oil starvation. Is the
oil getting too hot? If so you need a cooler or bigger one. Run a little thicker oil say 10-40 or 15-50 for track use. As you go faster stock brakes/pads will be totally inadequate. Harder compound pads will help prevent fade and boiling the fluid.
I'd go for the Avons. That will be the biggest performance enhancement you'll see.