I am installing LS1 rotors and Calibers on my 68 that was originaly drum/drum and I have read everything that I could find on the supject. I have my drum hubs ready to turn down and am going to install new wheel stud also. I have noticied that the bolt dia. is differant on the hub to the LS1 rotor. I was going to use the wheel studs from the 98-2002 camaro, but that is going to cause the rotor not to go on? Should I use the wheel studs from the LS1 setup or stay with a smaller dia stud?

You worried the holes in the rotors are bigger then the 68 studs? Matters not (if I understand your issue correctly). The holes in the rotors are probably bigger then the 4th gen metric studs as well.

I was worried that if I use the bigger studs that the rotors would not fit on, but I see that the stud is not much bigger and it looks like the holes in the LS1 rotors are big enough to still go over the bigger studs at the old bolt pattern.

I just did this swap and kept my original studs: http://www.pro-touring.com/forum/showthread.php?t=38128

Thanks for all the info over @ pro-Touring, Hammered It looks like I am right on target with my swap.