Uh...Black...I think you meant you run 87, not 97. Here in NC, 93 is sold as super, 89 as mid, 87 as regular. As you pointed out, you may not have to run super after a timing bump, but most people do. The best thing to do is bump the timing and see if it pings under a hard load (WOT). If no, you're okay. If it does, you'll need a higher grade of fuel.