oil pan issues
FYI
I had a 496 BBC that the tach welds broke on the "flapper" in the oil pan, I was not as fortunate as you, mine got caught under the pick up and starved the motor, I noticed the pressure was down but went back up, on the way to the pits .went to start it for the next run and :(, motor locked up, it was @ pinks all out too. It was a high quality pan and got zero customer satisfaction from the company. FYI