Wheel Adapters or Re-drilling hubs

I have a friend who just got a new Corp 14bolt full floater that we planned on putting in his truck. He needs to convert from the GM 8lub to the GM 6lug pattern. He planed on just getting some wheel spacers/adapters but have found (from our preliminary research) that they are very expensive and very hard to come by. However I have read (in some old magazines) that some people have had their hubs re-drilled to accept other bolt patterns.

Does anyone have any info on this, who could do it, where to look, etc, etc.

Any other advice,

TIA,
Michael

Check with www.performacewheel.com for adapters. Mine cost $50 each.