I agree with "doing your homework" - my 67 "sprint" was not a sprint, just a ohc 6 with a used 68 4 barrel.
Repainted to a different colour and some weird restorations.
NOTE - rust undercoat can really hide a plethora of sins - watch out for the goop

Paid more than I should have.
Then went out and dropped another 15g+ for a 428 and other "upgrades"

Could I get 35 or 40 g's for it? Not a chance, but I will never sell, after all it is my baby

That said, next toy I buy, to quote the Who - "won't get fooled again"