If you lift the cab you can. But if you want to make sure that you're doing it properly, you do want to remove the heads, put in new gasket, and then you'll know it's done the way it supposed to be done. My big question would be with changing the bolts one by one is : how you do the tight down sequence properly? I mean it supposed to be tight down to 245 lb/ft in 3 steps, right? So you do the first step -80lb. Now if that is lower than the factory bolts - and it is - you do risk that the gasket brakes loose, and it won't seal.....
Maybe my theory is wrong, but if I'd install my ARP-s again, I wouldn't try to save a couple of hours, and like $100 on the gaskets, and after always wonder at a pedal-on-the-floor-with-Competition-tune , that " I hope, the gasket will hold it"..... even with studs....