Alterkation or K1?

To me, HDK makes Alterkation look like backyard stuff.

That’s very telling of you. Alter-k-tion was made by a long time member and , I believe, moderator over at Big Block Dart.
The guy has been building these suspension since the 90’s.
The welds on the k-frames are amazing.
I am not going to bash Denny’s stuff but a bolt on shock tower? C’mon, man.
I was actually looking at his stuff recently. You’re not going to save ANY money with his system. He has a nice low price up at the top of the page. Then scroll down and see how much the full kit is.
As far as steering geometry? All of them are a Mustang 2 spindle and rear mounted rack. His ain’t any better or cheaper.