spark plugs for magnum 360 carbed

Magnum heads and LA heads use the same threads and thread reach but the hex is a different size and shell is different size. The older LA plugs are 13/16 and Magnums are 5/8. I use the smaller 5/8 Magnum plugs in my X heads because they clear the headers better and they seal and work fine but I can't say if the larger plugs will work in the newer magnum heads. The only other thing you have to match up is the heat range.