Drop Spindles
The only "issue" I've had is the relocated tie rod end. Usually, if you run 17" rims the tie rod end actually fits inside the lip of the rim, allowing more backspace. With the drop spindle, it basically maintains the same relationship to the 17" rim as the stock tie rod does with a 15" rim, ie, its pretty much the limiting factor for backspacing.
That said, it STILL clears my 17x9" rims with a 5" backspace and 275/40/17 tires. So, not really an issue for most folks.
And that's on my e-body Challenger, btw. Not sure that set up would fit an A-body anyway.
The other issue to consider is bump steer, which the drop spindles increase because of the relocated steering arm. Here's the deal though- I know that the bump steer has been made worse numerically, but I haven't actually
noticed it driving the car. And I doubt most people would. Now, if you're road racing, it would be something to think about.
I do plan on taking the drop spindles off my challenger when it gets torn down and restored. I run them because I also run 1.12" torsion bars, and I couldn't get my car low enough using just the torsion bar adjusters. When the car is torn down though I'm going to clock the anchors in old school circle track fashion, so the drop spindles won't be necessary.