I wouldn't advise using the Astro. There's going to be alot of issue with the steering and engine mounts. The steering box mounts almost verticle on those, due to the short amount of space from the column to the box. It also has a drag link that connects from the pitman arm to the center link and 2 idler arms, which is a major source of steering slop on those vans. Another issue is that the engine is offset to the right (for steering box clearance) about 4". There would be some major alterations needed to make it work on a truck. Using an S truck or Camaro sub would be much better and easier.
