hmm... i think i'd prefer it with alnico 8 magnet (about $7 on ebay)
will sound less harsh on highs, fuller on low mids and almost as tight as a ceramic
it keeps that JB like clean and gets very powerful on distortion
in my duncan custom it sounded wonderful
i think you'll get similar results with alnico 8 on 498t
it may get a little muddy on too bright pickups, cause it usually gives a lot more mids than alnico 5, but i think 498t is a little mid hollow like a duncan custom V, so it will probably make the pickup sound a lot fuller
i almost bought a 498t to try this mod, but i already ordered a Holy Diver/Cold Sweat combo