OK guys,
I would love to just throw them on and ride, but I'm talking a BIG difference. When I picked them up, the rear sprocket was easily 3/4" further in than the tire, there is no way you could've gotten a chain to it. I took the front one home, because it looked OK. It turns out it wasn't, the spokes were hitting the brake caliper, no matter what I did to avoid it. East Coast Wheels even called the shop and gave them the necessary offsets: 4mm in the rear, -1mm in the front. They still couldn't get it to work. ECW's says it can definitely be done with my stock spokes and hubs.
Chriscap, my bike is a 2004 KTM 625 SMC. I'm using my stock hubs/spokes, I just switched from the stock Behr rims to Excel rims, same sizes.