I put this reply on "crate motor upgrades" but it might not get noticed there, so I'll say it again... I'm thinking I'll order an MSD-6A ignition from Summit. Should I get just the box for $130, or is it worth it to get the Blaster II coil, etc for $190?? Anyone have one of these? Did you notice a difference in power, responsiveness, mpg? Any place cheaper to buy it? Thanks for the input... GUZZLES GAS BUT IT'S FREE AND CLEAR!!!