id check a junkyard just so you actually know what the condition its in. its up to you whether you want a long or a short block. a 3.0L shortblock with the 2.5L heads is a lot easier and will give you more hp as it raises the compression to 11.2:1. you also have to fill an oil passage in the block itself with jb weld. if you do decide to go with 3.0L heads, the compression will remain the stock 10:1 and youll have to go through the hassle of putting on an electric waterpump because the 3.0L's WP is not driven off the camshaft. My opinion, if your just wanting to stay naturally aspirated is just get a 3.0L shortblock, and swap over everything else from your 2.5L. If you have any other questions, check over on the 3.0L branch of
www.contour.org. Many people have done it over there and can answer all your questions.
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"The CEG Nazi"
www.contour.org
1996 Ford Contour SE - Sold
3.0L V6 and Arizona Dyno Chip Turbo Kit
364 whp, 410 wtq @ 16 psi and only 4,700 rpms.
1999 Tropic Green SVT Contour - Bone stock and MINT