OK, I have looked through the posts, and gone to the vendor sites but have been left a little let down interms of content - So here goes
I have a 78 TA, I have already welded up the stock front sub frame. Ideally I would like to use the AFX tall spindles (checking on availability) with good tubular upper and lower control arms. Short of that, I would substitue Howe tall ball joints along with good upper and lower tubular control arms. My problem is the control arm vendors that I have looked at - SC&S (globe west), DSE, Guldstrand, and Hotsckis, none come out and quantify the camber gain or bump steer correction. All say they have increased camber gain and decreased bump steer but to what extent. I find that it is impossible to measure one against the other without some quantifiable values.
Those are great questions. And as far as being quantifiable, do you know the camber gain of the stock suspension setup (at a known ride height) for the benchmark? I don't know those numbers and I think this could be a great thread for getting that data posted.
Bumpsteer can be measured and dialed down to a minimum with the right tools (barring any major issues and crazy low ride height). I've done that on my car using a Longacre bumpsteer gauge and a set of Baer Trackers.
As for the camber gain, it is my understanding there is no camber gain with the original design. Of course that is a gross average not a precise measurement.
No tubular control arm (that i know of) is going to change bump steer. unless the arms are shorter or longer, as for camber gain the only way to change it is to relocate the control arm mounting point (guildstrand mod on first gen)or the ball joint pivot location so tall ball joints or ATS Tall spindles. you would never know the differance on a street driven car.
have a look at our arms, i noticed you missed them in your product search