Do a search on eBay for 4.0L Olds Aurora V-8 engne pricing. You may be pleasently surprised at just how inexpensive that 250HP engine really is.
If it's an uncomplicated swap, it may be a much better choice than rebuilding/replacing with the OEM 3.5 engine. I don't know, but I hope somebody tries the Aurora 4.0L swap-out someday to determine its compatibility with the VX and gives a report here on the forum.
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