Sorry, should have given these links also.
http://static.summitracing.com/global/images/instructions/maa-29014%282%291.pdf Follow the instructions and pictures for the YH advance. You can use drill bits instead of the keys shown like the guy did in the next link.
http://www.moparts.org/Tech/Archive/elec/25.html
Or buy the kit. http://www.summitracing.com/oh/parts/maa-29014/overview/

You will probably need 16-18 degrees at idle. Trial and error will get you there.