No, they never put Magnums in pass cars. You need to use the 360 pass car pan and associated parts for that. '72 and up will work, there weren't 360s before that. (273/318/340 pans don't work.)
I ended up getting the truck oil pan and a360 passenger car oil pan fabrication using the correct magnum pan up top the car pan on the bottom. No I can use the one piece magnum 360 gasket and no leaks.