I dropped a completely built 360 in my 72 dart, with lunati bracket racing cam and edelbrock intake. I have a high volume oil pump. When I started it I had 75 psi oil pressure. Drove it for several days and realized that my system was out of balance and I needed to go more mild. I removed the racing cam and installed an RV torque cam, new lifters, and changed to a stock 360 intake manifold. I started it up and now there is about 10-15psi at idle, gets to about 40-50 at high rpm... what happened?