I see both sides of the fence on this one. What makes it a tuff call is that it looks 100% stock, pristine and fully intact, not to mention running. It would seem criminal to hack it up and sell off the frame and power train, when one could say find a non runner or body skin and use just that. But hunting down all of the pieces you need for a work in progress is hard, time consuming and expensive, while this car obviously is ready to go now. I'm guessing you can't find an aftermarket body like say for a 32, though to be honest I don't know for sure. One of those HMMMMM moments. Pulling the engine and replacing it without cutting and doing the same with the transaxle, etc. gives you the option to keep the stock stuff if you decide to sell it down the line to a purist.
I would hate to see a chop job on this one though, since one in less restorable shape would do at that point, and then your talking lots of internal mods, that will waste the stock stuff in there. JMHO.