Ah yes, I remember that "Trinkets and Junk" guy as a foul mouthed ebayer with lots of bad feedback. Anyway, probably has nothing to do with the car or its condition. I think the front end has been replaced as the driver side front fender has the piece of rocker trim on it that the GPs lacked. There is no other rocker trim on it and it appears there never was.
The body tags have the final say and if it's an early GP, then that's what it is.
When I was in Sublette for the orphan show in 2012, Don Dinges or Dettore, I don't remember which, had a GP Frazer in the shed there - pretty rough but it had the vertical spacers in the grill.
Regarding the engine, the GP Frazer had the fuel pump toward the back of the engine so if someone wants to do an authentic restoration it will be a challenge getting the right parts but they will have a truly unique car when it's done.