Oil pan.

pishta said
no, a 360 has a larger rear opening. 360 only. Any chrome 360 car pan will do, maybe a little ding where the idler arm is.....

cudamark said
Yup, you need a 360 car pan. Depending on which one you get, you can probably reuse your 318 pickup, dip stick, and tube.

I ended up getting the milodon stock replacement one from JEGS