Guys, use BMW full size sedan CV axles. They have the same spline pattern as the Corvette and S10 hubs and a flange style mount on the other end. The bolt pattern in that flange is different from the commonly used transaxles, but a simple adapter is cheap and much easier than cutting up axles. The BMW axles are available in numerous lengths at any auto parts store for under $100 and they are a healthy 1-1/8" thick. Also, the adapter can be made any thickness to fine tune the required length. If you are using a Hall Effect speedo sender, cut the sender grooves into the adapter while it is being machined and save several hundred dollars on parts later.
actually there's a member Wigl4me ( i think that was him) who mention to me on email about the beema axles and found exact length he need it.
Pedro, please check with qualify welding shop about the axle shafts. GM axle are harder ( more carbon ?) you don't want that snap on you one day, while driving. I forgot what's called . you can google up how to weld hardener metal, but let the pro do it.