Preheat the oven to 350°F (175°C).
In a medium bowl, combine the graham cracker crumbs, melted butter, and 1/4 cup of granulated sugar. Press the mixture into the bottom of a 9-inch springform pan.
In a large bowl, combine the remaining 3/4 cup of granulated sugar, brown sugar, cinnamon, nutmeg, cloves, and salt. Stir in the pumpkin puree. Beat in the eggs one at a time. Gradually add the heavy cream and milk. Stir in the vanilla extract. Pour the mixture into the prepared crust.
In a small bowl, combine the chopped pecans, flour, brown sugar, melted butter, cinnamon, and salt. Sprinkle the mixture evenly over the pumpkin filling.
Bake for 50-55 minutes or until the center is set. Remove from the oven and let cool completely. Refrigerate for at least 4 hours or overnight.
Serve chilled with whipped cream on top.