I'm not familiar with the early '90's 4Runners aftermarket lift kits, but that frame mount for your trailing arms definitely looks aftermarket. For me the stock frame mount of the trailing arms is annoying to get caught on rock ledges even without that crazy looking downward extension that's just asking for rocks to hang you up. The stock mount is in the bolt hole that's above the aftermarket mount's hole.

Does anyone know what brand of lift kit that is from?

You'll need to get different aftermarket swaybar endlinks since those ridiculously long ones are obviously aftermarket or homemade and seem to be the primary reason why they had to extend the link mount lower. You definitely don't need the swaybar horizontal in order for it to flex properly so I'm baffled why anyone would do that. That weird mount also made your pinion angle slightly worse. Is there a problem with rubbing or contact from the rear axle or rear tires that would necessitate moving the axle back a tad?