[Dean]

I think you only need one set for the rear for a street car. The stock one in front is fine for most street circumstances. The -.8 you mentioned is fine in the front. I think a single set in the rear will get you back close enough to -.5 or so.

The top hole in the front strut is not round due to the odd oversize camber bolt, so a smaller head aftermarket bolt will not have the grip/bite that the stock one does. I would agree replacing that one would be sketchy.