I am doing a rear end swap with a 2015 track pack IRS (3.73 with Torsen and steeda upper arm). I plan on doing viking coilovers. 2 questions:

1) When the car is at its resting point, fully weighted and ready to roll out, what angle should my half shafts be at? perfect 0* ? We're not talking pinion angle or driveshaft angles? I'm talking the half shaft axles coming out of the side of the pumpkin. If they sit at 0* can I assume the tires should be theoretically perfectly vertical, no camber? This is for a straight line street/strip car. Should they be angled down a bit when resting and riding (some camber) so when I step on it and the rear squats the entire tread gets put to the pavement?

2) This IRS I bought currently has a toe-in like I have never seen before (stock non-adjustable toe-end links). When I measure track width from outer edge of tire to outer edge of tire, I get 75" wide at the rear of the tires and 73.5" at the front of the tires We are talking a difference of 2.5" difference. It is very visually obvious. I am measuring this with the half shafts sitting at 0*, perfectly horizontal. This IRS is new territory for me so I do not know if this is normal, but just from the naked eye it looks ridiculous.

Any help would be appreciated. Pics to follow later.