Depending on track conditions and and the size of track, you will need different tires.
10" rims all around. Less tire roll.
If you already have long travel arms, you could just put your stock shocks on to lower it.
Make sure your rear end is soft so your weight can transfer to the rear tires for traction instead of just spinning.
If the track you are racing on is very loose and dirt like, you will want very soft compound hoosiers, they will hook up much better.
You do not want to be spinning your tires in the corners, I've learned this. Use your clutch if you have to to keep them from spinning, once your tires brake loose, you might as well move over and let the guys pass.
Most tracks will not require hoosier style front tires, but trust me, if you have them, they will pull you right through the corners. knobby tires have much less surface area contacting the surface of the track so they will just want to slide and if they slide, then you will want to slide your rear end around to correct for it. Once you start sliding out, you will spin before you know it. If you are really unlucky, the rears will hook up when your sideways and you'll flip. I have learned that too lol
Anything else, just ask!