What's wrong here?

[CVA59]

OK guys, the only 1966 part on this truck is the frame itself. The front end is from a 1986 Suburban donor and has been 100% rebuilt. The is a nearly perfect cab with new cab mount bushings it is sitting withing 1/8" of being 100% plum to the frame rail. However, the problem is the pass front wheel is offset outward almost 1-1/2" as opposed to the drivers side front wheel. Both rims are a matched pair and brand new. We have measured the cab to the frame and no matter where we take a measurement it is never more than 1/8" out. When we measure the outside front fender lip to the center of the wheel hub the drivers side wheel is as i say, offset almost 1-1/2". Can someone please offer up some input on this because dad and i both have measured and measured everything 1000 times. The only thing different is the fenders in relation to the wheels. We checked the a-arms and it has already been 4 wheel aligned. Ideas, suggestions, input???

Thanks