Subframe bushing bolts '90 100

[Howarth1 at aol.com]

While trying to track down an annoying suspension rattle I noticed that my 
subframe has fairly easy movement in it when levered with a pry bar.  I put a 
socket on the right forward bushing bolt to attempt to tighten it (as it was 
loose enough to spin the washer with my fingers) and it just spins as if 
stripped.  Two questions: 1.  How much movement is normal in the subframe?  
2.  What is the subframe bushing bolt threaded into?  Did a tack welded nut 
inside the frame break loose or are the threads in the frame itself and 
simply need to be tapped out?

On another subject.  The lower control arm ball joints have the bolts going 
from front to rear with the nut on the rear side.  Is this correct?  I always 
thought that the bolt should face forward with the nut on the front side.  I 
also noticed that the ball joint shaft is protruding further out the top of 
the strut assembly on one side than the other as if one side is sitting lower 
on the ball joint than the other.  (like did the guy who put my new control 
arms in tighten the bolts up, backwards, before the car was sitting on its 
own weight)?  Is this significant?       

Any help will be greatly appreciated.

Richard