Can't seem to find the factory head gasket compressed thickness on a 360 Magnum...

Post four in this old thread I listed as .039" compressed for ones I measured at that time. Notice the Magnum gaskets also have a smaller bore diameter and most replacement LA gaskets are larger, so using an LA gasket with thinner compressed thickness may not gain much in compression.

Holes in the head. (Memory actually)

Edited to fix “LA gaskets are larger.”