76 should be post-lawsuit - meaning the headstock shape is not like gibson's "open book" one. That means that guitar is NOT a "lawsuit" guitar and some of the popular opinion pertaining to the so-called lawsuit guitars doesn't apply to that one. The build quality actually improved as years went on and the mid seventies ones aren't bad players at all - in fact some of the LP copies made around 76/77 actually have set necks rather than the bolt-ons. Depending on price and condition it might still be a worthwhile buy but spend some time with it first. Don't buy it if you want an authentic sounding LP thought, these guitars have unique characteristics. Do you have some more info on the guitar? pics etc?
I have an older one - 70/71 model. I really like it - it's my favourite guitar - but mostly for sentimental reasons rather than it being an awesome player ? it has an awesome dirty/gritty sound that works perfectly for blues, although it's much brighter than an LP should be. Most of what Alan said applies to my guitar though - it's not the best player. I had the electronics replaced and some work done on the neck but it still has a few niggles (I like to refer to them as "personality traits") but it has a hell of a lot of MOJO!!
The best resource for researching these guitars it the ibanez collector's forums:
http://www.ibanezcollectors.com/forum/index.php/board,11.0.html