I have a 89 suburban and the dist is the original one. I have also switched to a 30" tire coming from a 27" tire, if it matters. I would like to improve my low end,to get the heavy vehicle moving and maybe gain a little in fuel mileage. The D.U.I. Distributor claims to give full spark through out the entire rpm range. Do you guys think 300 bucks is worth it for the dist? You guys have any complaints that have one?