Being you are using the stock C4 components I would think using C4 shocks and matching the angle gives you the same as the Vette had, which is pretty nice. Of course your car is likely lighter than the Vette so that could be an issue but look into that.
And an other thing, be sure you make it strong enough. Often people think because it's "just the shock" and not holding up the car or anything they make it a little light. That shock bracket has to withstand millions of positive and negative forces on it and it has to be strong enough to withstand this.