Installation is simple goes on before the wheel, put some anti seize on there and bolt them on, then put the wheel and tire on. The F150 ones run $150-$200 per pair, you can go for a staggered look and have the rear stick out and not do the front.
Yeah, the King Ranch wheels are nice. The clamps should work. Have you looked at a wheel spacer to give it a little more room without switch out the rims? I had them on my Mustang and it looked great and helped with traction also.
The stock rim is the problem, because it has a positive offset it sits inside the fender and rubs the e-brake line if the tires are too wide. Using after market rims with a negative offset would allow more space since the wheel would side outside the fender.
I just got the blocks in yesterday but I decided to just go with the 6" lift kit because I found a place with a great deal on the pro Comp. Are you running the stock wheels with the blocks? I was told you needed a wheel with a negative offset or you could run into the brake line problem.