Lunati Voodoo Roller Rocker Arms

I looked around some places. When using the chevy rockers without the larger diameter mounting stud they described the conversion as suspect at best. They said the rockers wallowed all over the place. Their solution was to use Olds guide plates and larger studs that it worked better. By the time you get the guide plates, drill and tap the heads, buy the studs, and buy the rockers it seems that it is a lot of expense and frigging to gain 10-15 horsepower I would be interested in hearing from anyone who has used the Hughes magnum rockers.