The conversoin takes you from 6 lug to 5. You just have to swap out axles and put the new drums on that come with the kit. The 8 lug rear end is more heavy duty. I also moved my panhard mount "frame side" back about an inch to get it to line up again.
http://www.classicperform.com/Store/.../6369RAC-5.htm You could use drums from your local parts house. Or.
http://www.classicperform.com/Store/...k/6569RACK.htm