Alterkation or K1?
Wow, calling the OE K-frame weak is a real stretch. Are the welds always the best, no...but from a shape perspective it's basically a fully triangulated member, which makes a big deal when it comes to stiffness. The original k-frame with the strut rods so far in front and the OE LCA location is wildly triangulated and if it has spherical rod end strut rods (which make more of a difference than anything you could do to your car), they don't move front and back which is the major issue. Then you need a stiff LCA bushing and you're set, then add some torsion bars and a good upper control arm set to get caster. I have the hotchkis sway bar set as a personal preference but there are less expensive options. I don't have anything fancy in the back outside the sway bar, and I have stock tie rods. I have the borgeson box but you can get a pump and brackets for a small block from any v-belt mopar.
The worst part about any of the kits, RMS, HDK, GTS is that they are basically square tubing welded at 90 degree angles to each other with only one crossmember, AND they have the lower control arm cantilevered behind the rear mounting bolt for the original k-frame. I'm not sure what the tubing thickness is, but it is surely flexing a little (or a lot) based on the shape. If it was tied together behind there as a crossmember even if it was removeable it would be a lot better. I can't even think of a modern car that has such a short distance between the front and rear mounting points of the lower control arm. Yeah, people use Pinto front ends for years on hot rods, but they were basically cheap, light cars where the suspension was made for cheapness and easy manufacturing. Also you'll have to add to the $4995 a set of brakes which is $1000 for the most basic kit, which is not a pro-touring type kit anyway. I personally look at these as drag race suspensions. It does fine for that. I always thought the deal with worrying about torsion bars being a clearance issue seemed funny when all these kits have square tubing encroaching in the engine bay. If it was about the steering box, yeah I get that one.
If someone wanted to make an all out handling front end they'd be doing it differently than this, but you'd be welding to the car for sure. And the rear wouldn't have a triangulated 4-link either, it would be a torque arm with two lower control arms with watts link.