360 oil pan gaskets….One piece, 4 piece??

I'm sure I have some Magnum pans..........."somewhere," but they are completely not accessible. I'm pretty sure it has to do with those "steps" at the front of the pan half moon cutout.

Somebody posted a long while back, you can use the Mag pan if you pump that gap full of sealer. I have never yet installed the engine, (house fire) and I believe I used "right stuff." Not sayin' that is the "right stuff," LOL