I think there isn't enough room with the oem A-arms to allow a coil over to be bolted in. IIRC, the Chaos kit has wider A-arms.

If you are breaking Cv's do to steep operating angles you can replace them w/Porsche 911 CV/s for about $1500. Of course once you add it all up you are at the same costs of a built SAS, so it would depend on what you are doing w/your truck.

Steep angle are bad regardless of what you have, IFS or SA, driving style and keeping your ego in check will prevent a lot of breakage.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed