Cruisaaja - The driveshafts will work... just not as well. If you have the same ones I'm thinking of those are slightly different than the ones included in the kit. Take a look at the "slot" on the driveshaft where it connects to the universal joint coupling. From what I found on mine, the slot isn't quite as long as the driveshafts included in the kit.
This will make them bind up easier when put at more extreme angles. They will work, just won't be quite as smooth at high angles. So I guess it's a matter if you want a more durable part vs. a better performing part with the sacrifice of some performance.
Hope that helps a bit.
-Korey