I will tell you anouther thing to look for, the knock sensor hole. Trucks and vans have this provision. All others did not. The hole is located right behind the intake manifold. it is a blind hole,which means is does not go all the way though the block. It stands stright up. If the block in question does not have this hole you will not be able to hook your knock sensor up causing your check engine light to stay lite. Also, you cant drill and tape this hole,there is not enough material, the block will crack, the hole is pipe threaded.

One way to tell if its a roller block is to look at the lifter valley, it should have the two small,taped holes, for the lifter spider. To some it up, look for the hole, look to see if it has the provision for the spider.

I have a 92 that needed a motor, I started with a bare block, mine was cracked. I did not know about the knock sensor issue,but I do now, almost used a GT block. I hope this helps you out.