GM A-body Front Control Arms...

[Marcus SC&C]

Your best bet would be to upgrade to a B-Body or F-Body tall spindle with a geometry corrected arm for superior handling.

So, the "best bet" is the antiquated B-body/F-body tall spindles? Oh, unless you want a reasonable turning radius, proper steering ackerman, proper steering ratio and less than staggering bumpsteer. Then folks should use some kind of aftermarket tall spindles (which vary wildly), which you specifically designed your arms for, despite the fact that they`re all different and have a different ball joint axis inclination than the B-spindles that were formerly (a few minutes ago) peoples "best bet".
I hate to break it to you, but the guys on this forum are a LOT smarter than that.
Bottom line, arms of any kind or brand certainly play a role in the suspension but it is only a supporting role. The geometry and performance of the suspension are defined primarily by the pickup points (pivoting points) of the suspension. On a car such as a GM A body which has totally backward suspension geometry by modern standards you`re only putting bandaids all over the car until you repair the geometry by moving those pickup points. In this case the primary errors are vertical and arms aren`t capable of moving these points,they simply connect them together they don`t define them. So you don`t pick a set of arms because they look gee wiz cool and then select a set of random spindles to use with them. You select the spindles (or other geometry altering components) to redefine the geometry to suit your needs and then select arms which are configured to compliment them.
There is no "one size fits all" suspension solution for all cars,all applications and all drivers anymore than one size,type and style of house would suit everyone. Savy companies will build a custom package to suit each clients goals, budget and needs. Mark SC&C

[Tony_SS]

I tried some solid 'geometry corrected' control arms and they failed me miserably.

The Stage 1 kit with SPC adjustable arms from SC&C worked out perfect.