Make Filling: Adjust oven rack to lowest position and heat oven to 450°F. Heat sugar, syrup, cream, and molasses in saucepan over medium heat, stirring occasionally, until sugar dissolves, about 3 minutes. Remove from heat and let cool 5-10 minutes. Whisk butter, salt, and vanilla extract into syrup mixture until combined. Whisk in egg yolks until incorporated.

Bake Pie: Scatter toasted Pecans in pie shell. Carefully pour filling over. Place pie in hot oven and immediately reduce oven temperature to 325°F. Bake until filling is set and center jiggles slightly when pie is gently shaken, 45 to 60 minutes. Cool pie on rack for 1 hour, then refrigerate until set, about 3 hours and up to 1 day. Bring to room temperature before serving.