Oil capacity for magnum with LA pan

Something to note, my 1988 Chrysler Fifth Avenue specified 4 quarts for the 318's oil, it definitely read "FULL" with only that much in it... did they change the pans on the later pass-car LA engines or just change the dipstick to read lower, perhaps to reduce windage? I'm running a windage tray as well so I'll probably go with 5 quarts anyway...