flipping nbs uca

i have a 00 gmc and im looking to flip and switch my uca around on my truck

i know that the ball joints are tappered so how do i go about drilling or reeming out the stock spindle or do i not have to do any of that stuff?

i have the rear of my truck laying out but the front is chillin at a 4in drop right now waiting for the bags to be put in

i have to wait to put aftermarket spindles on my truck because my winter tires are studded 16's and i need to roll them 2 more winters before im out of alaska

thanks