Lower ball joint question.

Up against the leaf spring, it ain't close until about 1/8th inch, with the tires aired down to 24psi. That part of the tire only varies with tire pressure. I don't think Coopers can corner hard enough to move that far over at a normal 29 psi. They will slide first.
But beware, not all leafs are installed parallel. So you better check both the rear and front distances to the sidewalls. It looks like you have plenty in that pic.

205/65-15s are about 25.5 tall. That is only .4 inch taller than my 235/60-14 fronts.
IIRC the factory tires were 24.7 tall.
Interesting maybe I'll do that run the stock wheels upfront with to get that stock offset and just get the size tires you have for the front. I'm getting rid of this 7 1/4 rearend I'm shorting a Ford 8.8 I got from the boneyard right now so it going to be interesting to see if that offset will work back there. So I'll have a 410 gear limited slip with those brand new leaf springs and new shocks not air shocks though I want those gone. My car has frame connectors the weld in ones torque boxes it was solid to start with but I want to build a car that lasts. I'm never selling it so I'm doing what seems right. I really wanted a 373 ring gear but all they had was a 410. I probably got 600 bucks into that all new everything.