Clois, One thing I heard years ago that I've taken to heart is with the
oil system. Running down the road at 70 mph on an engine that holds 5 quarts of
oil only leaves about 1 quart in the pan. The rest is in the engine and filter. If you are using a stock pan this could cause
oil starvation in the corners. It might not show on a gauge because it can happen so fast. I would use a good road race pan that holds a greater quantity of oil and has the baffles which stop the oil from all running to one side or the other. A good accusump system is also inexpensive and will maintain oil pressure if it drops below a certain limit. They are also great for startup because you can prelube the engine before you start it.
Sorry about your trouble.
Don