Have you got a short 3/8"unc bolt in the hole at front of block that goes thru to the mechanical fuel pump pushrod, that could be your oil leak. Try a bit more or less toe in at front to see if it kills the vibration.Ran COTA again last Sunday. The car ran generally well without any real problems. That's a first. I still have a vibration in the steering wheel under hard braking but it is better. I think I will need to turn the rotors and see if that makes it go away. I also have a minor oil leak from the front of the engine. Maybe a couple of ounces over the whole day. I still want to fix it and maybe I will pull the motor and have a good look.
But all in all a good full day without any real problems.
I don't know how relate-able this is, but we found the pad compound in our Sprint Cars makes a huge difference. We tried multiple brands and compounds and have settled on what works for us. We run the BP-40s in the back (main) and front (left) and when we run an outboard rear we run PolyMatrix Bs in it. I've found the claimed Wilwood compound characteristics to be spot on.I tried a different pad material this time. Wilwood A pads were replaced with their B pad. Not much difference really. I am going to take the rotors off again and have them turned this time, maybe surface ground if I can get it done locally.