1960's ford trucks

Hey, I've got a 1961 F-100 unibody that I've been looking to fix up as well. First of all, does anyone know exactly how rare the f-100 unibodies are? I've been told there were limited #'s of these trucks manufactured & still around today? I'll keep an eye on this post as well to help myself out. Thanks in advance to all for the info. -N2BNLOW-