I do think though the bolt-on kits (new arms, spindle, etc.) are neat but overkill and quite expensive. I'd also question the all-metal strut rod ends: clanking and the potential to break. If you live in an area with lots of rough roads and potholes, the OEM rubber bushings or even graphite impregnated, no squeak poly bushings might be a better idea.
Have been bracket racing the Falcon (and her Mustang before we sold it) for around 18 years - have broken two strut rods with poly bushings during that time. One on the track at the 60' cone - fortunately - and one - also fortunately - in the pits. SO update the rods if possible and put up with any noise. Yes, I'm still running on strut rods but will be looking to update with a coil over kit when all this other $$$$ crap we have to dump money on washes away.
My larger issue is that I really need a full front kit - front steer rack, etc and not just coil overs. So I hesitate to dump $2000+ on just a coil over when I should put $4000+ in the car.
For any track work especially drag racing you'd want adjustable shocks on both ends, especially the front. So that $1999 kit has some really good parts, apparently.
All that said - my drag setup is 90/10 CEs in front, Moroso Trick springs, 1" upper arm drop, stock re-inforced upper control arm, stock lower arm with poly, poly spring perch bushing conversion, Cal Tracks and adjustable Ranchos in the back - front spring eye bushings are aluminum parts, rear poly shackle bushings. Never saw the need for the roller items.
PS FWIW - as a tech guy, I find fault with Vi-King for having a web page built in 2015 that still has "under construction" and their online catalog relies on Flash, which has been long retired due to security issues. A shabby online presence doesn't reflect well on the business.