Be very careful when adapting a different front end to a frame it wasn't engineered to fit. There's a built-in angle called "Ackerman" (AKA toe-out in turns) that must be considered, and it varies with wheelbase. To over-simplify things a little, as the front wheels turn away from the straight ahead position, both front wheels and the rear axle must follow an imaginary radius several feet long that lets them pivot smoothly without fighting each other. That is determined by the length of the steering arms at the front spindles, and their distance away from the pivot point of the spindles. Changing wheelbase has a pretty radical effect on Ackerman, so a rig that steers well in a straight line can have very unpredictable handling in a sharp turn at highway speed if the wheelbase is shortened (or lengthened) in comparison to the original application of the front suspension.
As a general rule of thumb, a line drawn from the spindle pivot points to the center of the rear end with the steering pointed straight ahead must also intersect with the pivot points where the tie rods attach to the steering arms. Do your homework on steering geometry before you encounter some nasty surprises in a tight turn.
Jerry
