Questions on GM A-Body suspension/chassis setup

[josht]

I have a 68 GTO and wanted opinions on my setup before I completely commit to it.



Front:
ATS AFX tall spindles (have)
ATS center link (have)
New pitman arm (have)
New tie rod ends (have)
ATS Billet steering arms (have)
Lee Performance 670 Steering box with Rack and Pinion valve technology (have)
Rag joint coupler for ATS/Lee Performance 670 Steering box (have)
Hotchkis adjustable tie rod sleeves (have) (possible for sale)
UMI Performance tie rod adjusting sleeves (have)
SC&C SPC adjustable upper control arms (have)
Howe precision ball joints (have)
Global west lower control arms with bushing upgrade (have)
ATS LSX engine plates (have)
Polyurethane engine mounts from ATS (have)
Polyurethane transmission mount from ATS (have)
4L60/4L80 transmission cross member (need)
Adjustable Hidden Spring Shim:
TD 3-1/8" - 5-1/4" front (have)
Tru-Coil™ Front Racing Springs - 5" x 9.5" 650# (have)
1 1/8" Hotchkis hollow bar sway bar. (have)


Rear:
Moser 12 bolt Ford Torino style ends with a 3.70 ratio (have)
Umi Performance single adj upper & lower control arms #401417 (for sale)
Umi Performance bolt on lower control arm brackets #4012 (for sale)
Umi Performance bolt kit #3002 (have) (one set for sale)
UMI Performance weld-in lower control arm relocation brackets #4010 (have)
UMI Performance double adjustable upper & lower control arms #402717 (have)
Bmr Fabrication Control Arm Mount Reinforcement Braces RB002 (have)
Bmr Fabrication drive shaft safety loop DSL007 (have)
Tru-Coil® Rear Racing Springs 5" x 10-1/2" 150# (have)
Coil Spring Spacer (need) {do I need these?}
Adjustable Hidden Spring Shim:
TD 0" - 2-1/2" rear (have)
1" Hotchkis rear sway bar (have)
Rear upper coil spring isolators (have)

Am I missing anything?
The car has factory power steering according to PHS what needs to done to swap out to a Lee 670 steering box? <nothing, this is a bolt in deal>
What is the ratio of the Lee 670 steering box? 12.7:1
Do I need to do more than drill new holes in the chassis to bolt/weld the ATS LSX engine plates in the correct location for the new engine? <not exactly>
If I want to get the frame powder coated is the best way of getting it setup correctly is to mount everything with the engine and transmission then pull everything off it?
I assume that I would order the driveshaft last after I confirm that the engine and transmission are sitting right and everything is bolted back in? <yes>
I have a 1" Hotchkis rear sway bar, should I even bother installing it? <It needs to have a front sway bar to go along with it>
For the rear springs should I with Tru-Coil™ Rear Racing Springs 5" x 13" 150# instead? NO
Should I consider 750# springs for the front instead of the 925# ones ? 575# or 650#
Which shocks should I get for the front and rear? Alston Varishocks 16 adjustable settings
I have the complete rubber bushing body kit from OPGI will this be stiff enough? <should be>

thanks