Keeping the original wheels.

[mgkgmc]

I just installed the Ece disk brake drop kit on my 70 GMC and I am wanting to use my original steel rims on my truck. Is there a way to use some kind of spacer to push the wheel out to clear the caliper? If anyone has done this can you tell me what spacers you guys have used and the specs. I have heard spacers are not always the safest way to go but I prefer not spend the money on new wheels and tires. Your help would be appreciated Thanks Guys