Yep, you said you're using an LA block....so that's why I suggested pans from LA truck motors. As I'm sure you know, 318 and 360 pans are different sizes in the rear main cap area. Timing cover end is the same between the two. Any 360 truck pan from 72-91 will have a rear sump. Get a 360 pan gasket that is three piece LA version and you should be good to go.