Roger, think of it this way. Say you're new to old cars and old engines with a carb. This $400 unit could save you a $5k (or more) engine just by the data you receive from it. From the videos I've seen from a couple of other carb cheater users they love them. Granted both guys already had their carbs pretty well dialed in but both guys, this unit changed the way their engine ran and improved AF ratios. I can't see how that is a bad thing? This thing isn't a lot more than a good quality AF gauge. It sure has my interest. Also, this a heck of a lot cheaper than a LS swap.