Sorry because some of them got pretty lo fi with time.
From Brazil, Raul Seixas
https://www.youtube.com/watch?v=7VE6PNwmr9g
His partner, Sergio Sampaio
https://www.youtube.com/watch?v=rsiAN__ii7E
From Argentina, full album of La Maquina de Hacer Pajaros
https://www.youtube.com/watch?v=a_kc25WLvsA
Argentine psychedelic group Arco Iris, full compilation album
https://www.youtube.com/watch?v=Tts1ZqY9a8Y
Chilean psychedelic, Sol y Medianoche
https://www.youtube.com/watch?v=RsUuTP4DAMo
https://www.youtube.com/watch?v=uIDz55oCnSk
Rare stuff from Uruguayan act Tiempo de Rock
https://www.youtube.com/watch?v=OCyvSpbEypA