1. Get rid of those long shackles. There is no good reason to run shackles that long. One or two inch longer than stock shackles are ok, but those are just rediculous.
2. The new SPOA perches are way the hell off. Do it right and cut the new SPOA perches off and reweld them (or new ones) at the same degree as the old SPUA perches. Don't mess with shims or cutting and turning the knuckles.
3. For steering, you will either need a z-link (it works and is cheap, but there are better ways to correct the steering), or get a high steer setup (more expensive, but it will raise the axle end draglink mounting point and is a better setup than a z-link).