The holley 600 came off of my previous engine and didnt have one problem the 2 years it was on...It has sat up for a little while so I am going to freshen it up with a rebuild kit. Its hard for me to imagine dirt getting to my carb. I have filter on the pickup in the tank, one pre fuel pump and a clear one post fuel pump. I put in the smallest springs that came with the kit. I was told that will make the advance come in quicker. Would putting heavier springs in keep it from peeling out so much early in the rpms? Stupid question I know but I'm new. Any other advice would be greatly appreciated.