Difference between 318/340 and 360 Oil Pans??

It's very easy. The half moon cutouts for a 273/318/340 pan are nearly the same size or maybe THE same size. The rear cutout is considerably smaller than the front on a 360.

This is LA engine, only. Magnums work different. On Magnums, 318/360 both use same pan. I cannot remember if mag pans are actually different than LA, or whether it's in the mag gasket.