Big Block A Body oil pan

I measured my 187 pan with water. I put 1.5 gallons in there, 6 qts, and it was still 1.5 inches below the pan rail. So with another quart in the filter we're at 7 qts. With a quart circulating thru the motor, there should be plenty of clearance between the crank throws and the oil in the pan. Does this sound right? How much room do you need between the crank throws and the top of the oil surface?