Rear end location wrong? IM STUMPED!!!

If they were OK before then your issue is with your new leaf springs or Installation of the springs

He claims clearance was OK with the old springs. something wrong with springs or Installation

Nothing is wrong with the springs. The new springs lowered the car over an inch, which made the unsymmetrical nature of the car obvious. I'm sure it all cleared before, but it had more to do with ride height than body clearance.

i think it's two fold: it's tolerance stack for one thing, and the other factor is that he's lowered the car putting the wheel/tire combo more into the well and proximity to the lip where the sectional width of the tire is now exacerbating the already limited space.

245 is about the absolute limit on stock backspaced wheels and most of the guys running that have the *** end up higher.

This.

The wheels on the OP's car don't have enough backspace to max out the tire size in the back. 1" from tire to springs means there's a 1/2" of lost space there.