On my sons car we did just as Andy said. Put the base idle and cruise along with WOT timing and then pull the card and put it in the labtop and fill the blocks to make a great timing curve. When we first had it running before we filled in the full timing curve and drove it you could feel the timing jump from idle to cruise but we pulled the card and put it in the labtop and figured out how to make a good smooth curve filling in all the blocks. And then you can always modify more as my son is always tweaking his to get it perfect. Course we will be changing his a lot since its getting supercharged this year. Ron