Magnum Exhaust Port Dilema

I thought the Magnum exhaust port was better than the LA heads? Everything I’ve read and seen says leave the overall outlet shape alone. Don’t many fill in the floor of the LA heads anyways? Find a Magnum exhaust gasket (if one exists) and open it to that maybe. Me I’d leave that area as is and work the guide boss, short side and roof. But someone with more experience will know best