Hi everyone. I was wondering about installing a radiator overflow tank on my '71 GTO. My engine doesn't puke out antifreeze anymore. I think it found it's own comfortable level which when cold, is about 1-1.5 inches down from the top. This empty space represents maybe room for another quart or so of liquid. I'm wondering how important this empty space is to the cooling potential?? Does it really matter that much?? If I fill it cold, wouldn't this tank capture the overflow and then get reintroduced to the radiator when need be?? Any harm in doing that?? Or maybe if it's not broken, don't fix it?? Any thoughts on this?? Thanks, Nicholas.