Front Control Arms

[Interceptor5588]

I'm building up a 70 GTO for performance/street/touring with modern 17's etc. A complete suspension upgrade is in the works and I'm familiar with all of the suppliers and options. I have 3 questions:

What is your take on adjustable front UCA's (SPC) vs fixed (UMI?) I'm generally a fan or factory-looking components. Any disadvantages to either?

And delrin vs poly or high-durometer rubber? This car might hit the roadcourse once or twice a year in the long run, mainly a street/touring car. How harsh is delrin, really?



And tall (B-body) spindles for use with about a 13" brake upgrade, vs stock with 1/2" taller upper and lower balljoints?

Real world opinions and experience please.

Thanks.