Hey if you see that kit on ebay its crap. You could save yourself the money and buy some cooper wire and clamps like they are selling. Its the same on ebay with gutter gaurd inserts they are selling some of them for around 30 bucks when all you need is 2 bucks and a hardware store.
Are you talking a bout a curve kit that replaces the springs and counter balancers in the distributor? I used one of those in my '80 Grand Prix. I got a big boost in low end but I dont think it was 20hp. Im not sure it would work right on a computer controlled engine.