I have an 89 gt motor sitting in my back room.The motor has over 120k miles it looks like it only has like 20k.Look for the crosshatchings on the sides of the cylinder walls.I can see mine clear as day!.ALSO look at the original bearings and see how bad they are worn out<If they are worn out realllly bad they will be a goldish color everywhere if its normal use it will be a fine minute gold finish.Hope this helps a little and oh yea the new short bloakc and all that crap lol you could build an r block .

remember 87-92 forged pistons years 86 had flat top forged.
If your worried about the block take it down to a good machine shop and tell them you want it cleaned and checked out.