If $$x - y = \frac{7}{4}$$ and $$\frac{1}{x} - \frac{1}{y} = \frac{14}{3}$$, then $$x^3 - y^3$$ is equal to:

A

$$\frac{433}{32}$$

B

$$\frac{433}{64}$$

C

$$\frac{217}{64}$$

D

$$\frac{217}{32}$$