I think I have finally had enough of fighting with my carburetor and looking at the Holley efi Sniper and Hyperspark ignition setup. What's the difference between the sniper stealth and sniper, other than one looks like a carb. Will a drop base filter fit the same with either one? For those of you wondering why I'm considering the switch. I've dealt with carburetors before mostly quadrajets, back when they were still plentiful, but this Quickfuel vacuum secondary is driving me nuts. For about a year I've been been trying to get my car to idle at less than 1500 rpms without cutting off, and it had an off idle stumble so bad the engine would backfire though the carb and die If I didn't slowly ease into the throttle. Today for the first time in 3 months I actually had time to work on it, and got rid of the off idle stumble, but now the idle fluctuates between 1500-2500 rpms without touching the throttle. I'm guessing a vacuum leak? Will be couple of weeks before I can look at again. Right now I just want to drive it without spending all my limited free time working on it.