Like bud said, it is close. The cab and front clip should bolt on, but the bed is where you will have to make adjustments. You could make it a flat bed and not worry about relocating mounts.
I hava a friend that has an 85 4runner and rolled it. He took an 86 extended cab and an old pick up bed and put them on the frame. Of course he had to cut the bed down a bit. Its now bobed and looks really good. He did nothing to the frame, ( as far as shortening it) but he did add some body mounts.