I don’t have numbers in front of me, but I remember it being at least $1k+ or more for the COC.
Even if it is a similar price, I like that it can be done over time to upgrade the stock suspension. An aftermarket sway bar, upgraded torsion bars, Bilsteins and a set of offset bushings for the UCA and you are 3/4 of the way there and probably the same handling for $1500 or less. Do the adjustable strut rods and tubular UCA later. This is compared to dropping $5k+ ( or whatever the price is now) all at once.
My current project is a ‘73 Duster I am swapping a 5.7/T56 combo into and if I had to buy a COC kit to do it up front, I probably wouldn’t do it. The T56 kit was that much and I can’t see doing that twice before I even started on the project. The car is a /6 car, so I sourced a spool mount V8 k-frame and got it gusseted before I swapped it in. I also added the aftermarket sway bar during the swap. I had a set of 340 TB that went in until later. Other than that, it will roll the first time on that set up. At some point it is going to have the full boogy TB suspension along with 18” wheels and Scat Pack brakes and maybe even ABS, but it doesn’t have to sit on jack stands until then.
Add that I still don’t like how the coil overs load the chassis and the TB’s are a win for me.