I have a 318 with a mild cam, headers, 1406 600 cfm eddy carb, performer intake, and #302 casting heads that bring my compression up to around 9:1. My question is: has anyone seen any real results when using a carb spacer on a setup similar to mine? I see ads that claim a hp gain of 10 or more but what can i actually expect? I don't race, i just drive on the streets and like to drive it like i stole it occasionally. So im thinking about buying a 1" 4 bore spacer. Is this just a hit or miss kind of thing where i just have to try and see which one works best? I dont have access to a dyno or drag strip.