On my Shell Valley Coupe my Aviaid pan on a small block still dropped about an inch below the frame rails. I made a skid plate out of steel that bolts to the frame and shields the pan. Your ride heights should be about 4" front and 4.5-5" rear. Start with as everyone else said, a good road race pan that is as shallow as you can get. It only takes one raised man hole cover to leave all your
oil on the street.