This one and the black one have both been discussed at long length. Neither has convinced any of the big guys, and here's what's against them:
1.) Suffix codes are for Chevelles. There isn't one for Novas.
2.) Heads are 074s which are supposedly not right and GM didn't make a piston for it. Open chamber heads on a closed chamber short block.
3.) No documentation anywhere about them existing at any time. Production numbers given for them are mistakes and they represent the Camaro #'s.
4.) Plant manager from Tonawanda during the build time has come out and said "NO, we never built that engine for a Nova".
5.) VINs are sketchy on the pad
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