Preheat the oven to 325 degrees F (165 degrees C). Line a baking sheet with aluminum foil.

Arrange pumpkin halves, cut-sides down, on the prepared baking sheet.

Bake in the preheated oven until flesh is tender throughout, about 40 minutes. Set aside to cool.

Increase the oven temperature to 425 degrees F (220 degrees C).

Scrape pumpkin flesh into a large bowl; beat in sugar, heavy cream, sour cream, eggs, flour, pumpkin pie spice, and salt until smooth. Divide pumpkin filling between pie crusts.

Bake in the preheated oven until a toothpick inserted into centers comes out clean, about 45 minutes.