5.2 Main Caps

I was wondering if a 5.2 magnum main caps can be used on 273/318/340 block, I'm thinking of upgrading my main caps on my 273 I was figuring if I was gonna do it, I need an oil pan for road racing so could get a 360 one cause 5.2 magnum uses a 360 pan that way if I upgrade to a 360 later I can use the same pan.