what oil pan

The Magnums use the LA 360 oil pans, BUT you have to use the 4 piece LA oil pan gasket set. Cometic makes a very nice set, but you still need to use sealant on the 4 corners of the crankshaft reliefs. The one piece Magnum pan gasket will not seal an LA pan on a Magnum. I am running the Milidon 7 quart pan in my a-body, but had to notch the K-member slightly. It does hang about a 1/4' past the K-member.