As needsaresto stated the magnum head uses vertical mounting bolts verse the LA using bolts perpendicular to the sealing face. Besides redrilling the heads you have a low rise dual plane available from Mopar Performance, two high rise air gap style dual planes (Edelbrock and Professional Products) and a high performance single plane from Mopar Performance that have the magnum bolting provisions. Unless you are looking for something like a 6-pak, dual quad or tunnel ram the ones available will cover anything from mild to wild.