If you can afford it, your old plank floors would be perfect for re-milling. If it were me, I'd contact a couple of local mills to see what the cost would be to mill the planks to uniform widths. They need not be all the same width but do need to be uniform. In otherwords, all 14" width planks should all be 14", all 10" planks all 10" and so on. Then you can have tongues and grooves milled to the sides. Consider having them run through a thickness planer as well, to bring them all into the same thickness. Then when re-installing, use Carlisle's method of blind nailing through the tongue and gluing 8" OC with LP400. After finishing, if you want to install decorative cut nails, you still can. If you use the nails before sanding and finishing, they need to be set below the surface of the flooring.
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