That is a bummer, but I guess that's what I get for going with a much wider tire. I really did NOT expect new upper control arms to have this effect, in fact I was thinking it would have a bit of the opposite where I would gain a bit more clearance.
Just dropped off at the tire shop so I guess I'll wait to get a call back from a tech, but I'm with you @Black02Silverado, I've never used spacers and not a fan based on what I've read about them in the past - and I wasn't looking to replace with different offset wheels either. Guess I'm just bellyaching at this point but appreciate your responses. I'll update on where this ends up.
I guess my next question (because this is the first time I've installed new uppers) - why did the 315 tires NOT rub on the stock UCA when I was running a stock suspension? Thanks.