Build as a '64 SWB or use chassis under '51?

[Ronin8451]

Hey guys, I've got a dilemma . I just bought the contents of some unfortunate fellow's storage rental and it included 5 engines ranging from a complete '87 350 4-bolt main , a bare 454 block, a bare 350 block, a shortblock roller 4-bolt 350 and a nasty junk 302 F@%D and a bagged '64 short wheel base Chevy with Wheel Vintique Corvette rally's and 28/12.5/15 Sportsman Pro's and 215/75/15 Arizonian radials . I bought the "lot" for $500 with the intentions of using the rolling chassis under my '51 Chevy 3100, but I am having second thoughts about just keeping this a '64. The cab is channeled over the frame, but it was done poorly , along with the rear "z" of the frame being plated sloppy and crappy welds that look like they are from a cheap 110v mig with poor penetration and the rear frame being uneven 1/4" from side to side at the rear frame horn.
My friend has a complete '64 short step that I could probably get all the sheet metal I need to complete this for a song , or I could just move all of my current '64 stuff over to it ( don't want to though as it runs and drives great as is). What do you guys think ? Here are a couple of pics in the shop of it aired out . It has new firestone bags and a compressor/tank also.