My brother had a similar problem with a built 400ci V8 Chevy from a full-size van that he retired. He stuffed the motor into an Astro Van. The original V6 Astro van motor is essentially 3/4 of the 400 V8, so it bolted right in. A little bit of cooling system work and a programmable fuel injection did the trick. It's very fast and handles well. Right now the rear suspension is the limiting factor, but it gets something like 350hp to the ground. I drove it a month ago. Fun!

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Mark Stetson
1995 E320 Wagon Moonstone Grey/Parchment 106K mi.
2007 E63 AMG Graphite/designo 75K mi