I have the complete 408 with eddy heads. The one issue I have had was the dip stick missed the hole in the baffle on the kevco pan, counter weight snapped it off. I had to pulled the pan to get the broken dip stick out. I have put over 10,000 miles on it in two years. Some pretty hard miles. With about 25 1/4 mile passes. Also had to clean the mighty demon carb out three times. Best pass 12.74 at 108 mph with 3.23 rear gear. I have heard of issues with customer service. I think to do it again I would have one built to ease addressing any issue that could arise.