The car on the right is a 1969 Pontiac Firebird convertible, one of 11,649 produced that year.  Keen eyes will spot the "428-4" decal on the air cleaner which would seem to indicate the presence of the mighty 428 CID V8 under the hood.  Pontiac never put the 428 in a Firebird at the factory.  The swap was made during the car's comprehensive restoration, (which was fully documented via the book of photos displayed with the car).