I have done some reading on the bluebirds list and it seems like the 280zx strut spindle angle is slightly disputed...
This image from datsun510.com also supports your findings....
I have 2 sets of zx struts. 1 set with 510 perches that I ran on the car before with the 14" early 200sx rims and the set I'm am running now that are done up with coilovers and zxT snowflakes.
The first setup with the 200sx rims and 510 perches/random springs suffered visible from positive camber issues (no camber plates first year).
After doing up the coilovers on my other set of zx struts and installing them with camber plates and everything this year, I am maxing out my camber plates (positive) to give me front camber of between 0* and -0.5*.....
I am thinking that I may be a victim of crazy angle zx struts.
When I get home I will most definitely take them all apart to compare and try to get to the bottom of this
Jordan, did you ever get to the bottom of this "positive camber with 280ZX struts" issue? Anecdotally, I thought I observed the same thing when I installed the same setup you're talking about, a month ago. 280ZX struts, 510 perches & springs. It looked like I had positive camber. So I pulled that setup, popped in my old 510 struts, and ordered a set of coilovers to deal with the problem.
However, when I mentioned this in another thread a few days ago, members of the brain trust assured me that all 280ZX struts have 10 degrees of spindle angle, just like the 510 struts. So I finally did what I should have done a month ago: I pulled apart both my 280ZX struts and the stocker 510s, to compare angles. And sure enough, they're both 10 degrees.
That leaves me puzzled, though, about why I thought
I saw positive camber with the Frankenstrut combination (ZX struts, 510 perches & springs). What was up with that? Something installed wrong? Optical illusion? Plain old mistaken-ness?
This isn't just an historical question either. I haven't actually installed my coilovers yet, and so going back to the 510 perches & springs remains a live option. No caster / camber adjustability of course (my camber plates are the ones from DP racing that have some built-in caster), and if I run with the stock 510 springs I'd obviously not be upgrading in the handling department the way I would be with the 300 lb coilovers. If I cut them by a coil, I'd be getting a bit of an improvement, but clearly not the same as with the new springs.
So anyway: Did you ever account for the positive-camber issue you encountered with 280ZX struts and 510 perches / springs (your setup #1)?