Clois,
Funny you should ask this as I did my complete system just three months ago. I have an 8 quart Milldon road race pan and I took all the hoses off and changed them. I then took my air compressor and blew out the old
oil in the cooler. Here are my results.
Oil Pan= 8 quarts Reads right on full line
Filter = .75 quart
9 feet 4 inches of line= 1 quart
Oil Cooler = 1 quart
Started enging and let run until oil pressure was up and everything was warm, then shut it off and checked level. I had to add just about .25 of a quart to bring the oil back to the full line. This is with my 351 and the stock dip stick on the passenger side. I checked it once when the pan was off and my full mark is just about 1/4 inch below the top of the pan.
So with everything emptied it takes me almost 11 quarts to completely fill it again.
Ron