I just dealt with this same question. MSD recommends .050 to .060 for compressions up to 10.5:1. I set mine at .050 to be on the safe side. They say it's only a starting point and there isn't a one size fits all with this. You will just have to mess around with the performace and what the plugs look like when checked. I heard once that the larger the gap, the harder it is on the system, but I'm not sure. You are using all MSD you I think you will be fine. They aren't a johnny come lately company.