It could be either one. Most Pontiac V8s looked pretty much the same externally. Heads and intake evolved over the years. (This is a GENERAL comment. I know there were lots of changes later, but the basic architecture remained the same)
Just a note if anyone is dealing with JDS Racing. I read that Joe Cardoza, the proprietor, has been hospitalized and is in serious condition. Check his Facebook page for details.
Also around that time automatic shift patterns for all manufacturers were standardized to "PRNDL". Not sure if this was a government mandate or something the makers all decided to do.
The "uplevel" grille was used on Galaxie 500XLs and LTDs as well. I agree that the standard Galaxie/Custom grille would be a nice addition to this kit. Aftermarket?