Blueman33

I would first replace the temperature sensor. Things like thermostats and sensors go bad all that time. What if the sensor gives normal readings on street and erratic ones on hte track? That might mean the sensor is bad under track conditions, maybe high heat and centrifugal force, while works ok under low load conditions.

Secondly, I would ascertain that the rebuild included an oil pan baffle. Driving the track not only heats oil but tends to slosh it around on the corners by cetnrifugal force which can cause oil pressure problems including damage to the #2 rod bearing. If it didn't include the baffle, I would get one, they are about $60 and $150 or less to weld them in, and if that wasn't feasible and i've heard some folks overload the oil 1/2 quart to help with pressure problems and protection of rod bearings.

These are thoughts from a driver without all that much knowledge, so take it for what it's worth.