The 2wd & 4x4 frame rail profiles & cross members, are different and do not lend themselves well, to converting from 2wd to 4x4. A '63-'66 K10 or K20 rolling chassis, is the easiest, requiring the least amount of fabrication.

Tony Smith
4-5-6 Chevy Trucks
501 Scott Avenue
Kansas City, KS 66105
913-207-7789
[email protected]
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Custom Parts: http://www.flickr.com/photos/4-5-6chevytrucks/sets/72157627022818563/
www.4-5-6chevytrucks.com