Re: Tubular A Arms
Yes it is worth it, as long as the new upper arms actually reposition the upper ball joint. Most of the reputable manufacturers do this, such as UMI, etc. but some of the cheaper tubular arms don't. Compared to the stock arms, the upper ball joint is a little closer to the firewall, and this is what allows you to get more caster when you have your alignment done. The revised geometry (not the fact that they are tubular) is what provides the greatest benefit.
I have the non-adjustable UMI arms on my car. Overall I'm very happy with them. I do my own alignments, and it would be way easier to dial it in without having to use shims. Plus, I can only shim them so much before I start hitting my headers. For these reasons, I'd get the adjustable arms if I could go back and do it all over again.
'66 SS Clone
Fast Burn 385hp Crate 350 (for now)
Muncie M20 & 3.42 Posi
UMI Stage 2 Suspension all around