The problem is that a standard 1/2" wrench doesn't get in the spot very well. The gasket thickness is really irrelevant. The studs need to be the right length for the gasket used. The studs need to just pass through the nut when tightened down. The key is to start all of the nuts a couple of threads first. Then run them down evenly, with your fingers, until snug. Then tighten them down a LITTLE more with a wrench. I ground a wrench down and it fits in no problem. I think the worst one is the rear passenger side because of the accelerator pump arm. Not sure as it has probably been 15+ years since I had it on. Be careful not to overtighten the nuts. It's easy to put the rear throttle shaft in a bind. Then it will want to hang open very slightly and cause idle problems. I even wound the secondary spring a little tighter and re-bent the end of it. This is for double-pumper carbs obviously. Mine is an 800cfm marine model.
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