I used one of ma Mopars 1970/71 street Hemi and 440 6 pack 6 quart oil pans with the 440-6 pack stock oil pickup in my 1971 Duster
I used a set of Elephant ears back then but I would use front motor plate now
I slid the motor back around one inch on the stock rear trans mount and then had the motor plate tabs welded onto the top of the front sub frames to match the set back
I did need to trim, ground it with a 4 inch body grinder wheel, the back edge of the K frame lip around the oil pan sump to get some clearances (about 3/8 inch to the pan with 1/4 inch ground back
That set back gave me right at 50.1/4% weight on the front tires with me in it and that car flat hooked up
That pan holds 6 quarts plus one quart in the stock size filter and it is not low like some of the other earlier 1966/1969 Street Hemi 5 quart pans that needed the steel ( I can't think of the proper name that all the street hemi cars had welded on the bottom of the K frame so the oil pan wouldn't drag
) that none of the RB/B motor cars came with
I think Super Cuda tried to link to 440 Source clone hemi/ 440 6 pack oil 6 quart oil pan like I'm talking about
I use that type oil pan now on all my street pump gas motors going into 1966-71 B and E body wedge motors builds, they flat work very well
Some of the early C body stock oilpans will work but not near as well as the alter 6 quart oil pan does with the motor slid back a little bit