Coarsely chop the chocolates and set aside in a prep bowl big enough to hold the batch of ice cream, 1 quart (4 cups).
Combine cream, milk, sugar, maca, and the salt in a medium-sized saucepan and bring to a simmer.
Put the egg yolks in a medium mixing bowl and whisk to combine. While whisking constantly, slowly pour some hot cream into the yolks (tempering), then add back to the hot cream/milk. Transfer back into the saucepan and continue to cook for a minute or two until slightly thickened and temperature reaches 175°–180° F.
Strain through a fine sieve into a 4-cup glass measuring cup or bowl. Stir in the vanilla.
Pour just enough of the hot cream/egg over the chocolate to cover it. Let sit a minute then stir with a spatula until completely melted. Gradually add the rest of the cream, stirring until blended and smooth. Transfer back into the glass measuring cup and refrigerate until cool, overnight for best results.
Freeze according to the instructions for your ice cream maker.