g-force will be heavier.. there isn't a huge difference in weight savings with moly.. the properties of moly is what makes it more ideal. Also.keep in mind that not only is there more material to make it stronger.. but its also 4" longer.
The vortex cdi's aren't very popular.. since Duncan racing is the only distributor for them.. Might want to get a hold of Lenny at Duncan racing and see if he can help you out.