That's a GM Holden Monaro, I've posted them here in the past as they're one of my fav' South Africa cars.
These were built w/ Holden V8 308's also Chevy 327 & 350 SB's as the Monaro GTS327 & GTS350 which were quite successful on the track.
See 1'st pic below also note steering wheel plus w'shld & trim looks '68 Nova...may be the same although Hardtops, not sedans like Novas.
The 100 built w/ the 302 Chevys were the '73 Vauxhall CanAm Firenzas and my absolute fav' car...as 2'nd/3'rd/4'th pics below.
I've been trying to clarify what original engine stampings were on these cars for years but have never found absolute proof...much like here in N/A, the real cars are somewhat lost in a haze of clone and rebody cars.
[img]<<GRAEMLIN_URL>>/beers.gif[/img]
~ Pete