I might be wrong about this, but I heard the AWD Astros used a 4WD S-10 clip. I did a V8 swap in my 4x4 S-10, there were some additional issues that needed to be dealt with because of the front differential but nothing too bad. The oil pan was the worst of it.
From <a href="http://www.jagsthatrun.com" target="_blank">JTR</a>:
All-Wheel-Drive V-8 Swap
The 2WD Astro Van V8 mounts will not work with the All-Wheel Drive Astro Van. The All-Wheel-Drive Astro Van uses a Borg-Warner 4472 transfer case. It is a full-time four-wheel-drive transfer case that is also used in Oldsmobile Bravada, and in the All-Wheel-Drive S-10 Blazers. It was also used in the GMC Syclone and Typhoon Sport Trucks, which had 280 horsepower turbocharged and intercooled 4.3 V-6 engines. The transfer case will handle the power of 350 V-8.
The All-Wheel-Drive Astro Van uses the same front differential as a 4x4 S-10 Truck. To clear the front differential, the oil pan must be modified, or a modified pan can be purchased from Stealth Conversions for about $240. See our parts catalog for a photo of the oil pan. This pan is normally used in the S-10 4x4 V-8 swap, but it works well in the All-Wheel-Drive Astro Van V-8 swap.
I'm doing something very similar - different body but same drivetrain. The BW case mentioned above is fine, but you can't shift out of full time 4WD (or AWD if you want to use the buzzword). I'm looking at swapping an NVG 242 case into my setup, it's got full time 4WD, part time high and low and 2WD.
[ January 24, 2003: Message edited by: Stinkin_V8 ]</p>