How do you determine "ride height" to make suspension mods??

To run the fattest tire I can fit in there which looks to be a 335/30/R18 narrowest wheel I can run is an 11.5 -- so I am going with a 12" wheel since its easier to find (well I thought it was)

I did consider buying the Bullit wheels and widening them but when you break it all it will be about a wash to do the wheel from Billet Specialties. Only difference is a lot let chasing around for the finished wheel. And Billet Specialties can do custom width/bs matching from wheels too.

Bullit Wheel 18x10 = $165
Shipping to me on Bullit Wheel - $ 45
Shipping wheel to widening shop - $45
Widen wheel - $200 - estimate
Set back space while widening $75 - estimate
Shipping wheel back to me $45
Shipping wheel to powder coated to refinish wider wheel - $45
Powder Coating - $100 -- estimate
Shipping back to me - $45
Total to widen and get a finished to use wheel = $ 765

Yeah is $750 a lot per rear wheel + a $300 tire = $1000+ per each rear corner, YES IT IS -- But I must have bought all the cheap stuff already....LOL... Really what's (2K in rear wheel and tires) when I consider I am going to spend close to $5K or more JUST for the Alt K front set up and front brakes.

Might as well spend the money to make it the way I want it the first time.