So, I had a great day after a very stressful day. Yesterday I spent all day trying to figure out why when I hooked up my alternator the inline fuse at the battery would trip. I figured it out though the polarity (+,-) on the battery was marked backwards from the factory. So I finally got my engine running and am wondering what grade of fuel to run in it? For the time being I have 89 octane, But I heard I should be running 93? The engine is out of a 69 GTO, YS block, #16 heads, as far as I know it's all stock except for a few pistons (factory bore) and possibly the cam is different. It runs VERY strong right now, and don't want to hurt it's performance.
