I looked it over may be of some help for you guys doing the LS engine swaps:
http://musclerods.com/
http://musclerods.com/
Hey Zach, any chance you went through with swapping an LS in your 94?I asked them if they had a LS swap kit that they would recommend for a 1994 Astro. They told me that they don't offer an Astro van specific kit, but they sell a street rod kit that gives you the necessary metal and parts to weld up your own cross member.
From there website I am sure it's probably very nice stuff. For me I am looking for more of a bolt together solution.