I wouldn't run it like that much longer. You're prolly starving the wrist pins. Put a vac. gauge on it. Tap the bottom of the intake or a valve cover if your sealed upi good. I'd have 16"s on mine without a relief and I'm on methanol. Even though you're stating the max rpm that really doesn't matter as you will likely pull max vac. way before that. Ideally you want max vac at launch. Every motor is different so I'd get a vac gauge on it before running it next.