Quad carb setup information help

I've contacted a person in my area that has a sun distributor machine and can change the advance in my distributor if this distributor allows for it. I didn't pull it out yet however is there something I can do myself or does it need to be done on the machine? He said my cost would be about $85. Is this a reasonable price? I have no issues if its fair and its something I can't do. Thanks for your help.
Rod