Actually, getting a SPring Over Axle right IS a lot of work.
For your consideration ...
The basics ...
a) either purchasing or fabricating new perches and fitting them to the axles, this may involve welding - you're going to have to compromise between optimizing the caster angle - or - optimizing the pinion angle. You can choose to have them both optimized if you're prepared to cut the knuckles off and re-weld them. Insufficient caster angle is one of the leading triggers for "wobble of death", incorrect pinion angle causes vibration.
b) depending on how your perches were done, you may need to fabricate new shock mounts, this will probably involve welding, and find appropriate shocks.
No - you're not done yet, there's still the stuff that no one mentions up front ...
c) all the little bits & pieces - drive shaft spacers (because the drive shafts are now too short), longer brake hoses, etc., etc., etc..
d) finding a way to deal with axle wrap, because the springs are too soft to control the axle in an SPOA configuration
e) finding a way to deal with bump steer SAFELY, so you're looking for some sort of "high steer" kit, preferably one that will retain the correct ackerman geometry (does such an animal even exist?) and, no, a Z-link is not a remedy.