'89 360 LA valve spring/cam confusion

Well, got a call from the Head service this morning & of course both heads are cracked at each end. So the search begins for a replacement set, Dangit! Wondering what the normal pathway is - finding a set of 340/360 heads or going with the Magnum head route. The motor is a 89-91 so it has the roller lifter setup that is used by the Magnum motors although it is a LA .