I'd like to add some information about this car.
First it's not Graciela (with one L), because Graciela was the name given to the Sedán Justicialista after 1955 when Perón was deposed. Justicialista is the name of the political party founded by Perón, so the first thing the new government did was vanish that name form absolutely everything and the Sedán Justicialista became the Sedán Graciela. The chassis had two longitudinal side tubes and cross members, the bodies were made of steel, front wheel drive, first with a 2 cylinder two stroke engine and later with a 3 cylinder two stroke engine. See it here:
http://www.autopuzzles.com/forum/index.php?topic=8397.msg62022#msg62022I think CrazyAutopuzzler's 'Institec Justicialsta Gran Sport V8' was correct. Only three cars where made at the Government owned airplane factory IAME with V8 engines, the three cars have already been puzzle cars, the one of this puzzle probably was the first, then the other roadster:
http://www.autopuzzles.com/forum/index.php?topic=10808.msg87235#msg87235 and the coupe:
http://www.autopuzzles.com/forum/index.php?topic=15697.msg145862#msg145862. These three cars were larger, had a box type chassis, V8 air cooled engine, rear wheel drive and fiberglass bodies, they shared nothing with the Sedán Justicialista.
Here are two more pictures of the car
Perón at the wheel
Nélida Rivas, Perón's teenage lover, Evita's replacement, never admitted officially.
Back of above picture