Steering wheel/front vibrate when braking at highway speed

I've got a '70 Dart. When I got it, it was non-opped with DMV because it had a wheel shake above 50mph and the guy couldn't figure it out. I jacked up the right side and turned the right front wheel back and forth and watched the idler arm jump up and down. The car also had a slight pull to the left when braking.

I replaced the idler and the shake was gone. I spend hours and hours on the brakes replacing almost everything and posted on here several times looking for other ideas. The pull got more noticeable until I replaced my front strut bushings as recommended by somebody on here. The pull was greatly improved and barely noticeable at all. With all this going on the car was still eating up idler arms. I posted here and also spoke to a couple manufacturers. I was ready to do the idler arm conversion with the bearings added. Then the braking pull to the left started coming back.

The rest of the front suspension obviously was worn but didn't seem to be completely shot but I gave in over a year ago and ordered EVERYTHING and replaced it all. Pitman arm, idler arm, ball joints, control arm bushings, tie rod inner and out ends, bump stops- it was quite a pile of parts. The pull completely went away and the idler arm I installed at that point is still tight as can be. It's my driver so I've put a lot of miles on it and everything is working perfectly. I would recommend rebuilding your front suspension unless you know it's been done recently. If that's the case I'd still take a real good look at everything. Especially your idler arm. I had one get sloppy in just a little over a month but it had to caused by everything else being bad.