Dale,
You are, of course, correct in the official/technical definition of "Stovebolt."
But for purposes of this web site, we have loosened the definition just a tad, just a teenie skoosh (okay, so it's a hole the Hoover dam couldn't block...)
The official word here is that if it is a truck made by General Motors (or any of it's ancestor companies like Rapid or Samson, for example) then it's a "Stovebolt" here. Billy Marlow's '72 GMC 9000 with the 6-71 Detroit is a Stovebolt here as much as my '49 Chevy with a babbited 235. Or your streetrod with the Caddie 500 (great engine, by the way!).
We originally started out just for '39 and '40 Chevrolet trucks (back in '95) but that was too restrictive and after Tom Brownell suggested we expand to cover more years, we went all out and opened it up to everything GM up to '73. The site really took off after that (about '99/2000).
Historically accurate? No. Fun? I certainly hope so!!
Regards,
John