Over sized studs are still availible but I'd just go the screw in route there should be some availible with shoulders. That will only require tapping the existing holes but I'd go with the full adjustable type which cost more and will require guide plates, hardened pushrods and machining of the pedastals. Of course thats one of the reasons I just went with aftermarket heads is by the time I got them converted to the way I wanted it was only going to cost me about $200 more for heads that would be way better.