Do gears first if you need it. As for the intake, it's gonna shift your powerband up some even with the stock heads. I ran my eddy rpm intake for a long time with stocker cam and heads, no issues. It was just a touch flatter below 2500, and pulled more rpm (I ran myn up to 5800-6k) with the setup. The intake will be somewhat to big, but not enough to justify buying one for the stocker setup then another for your heads and cam. Without gears to get the motor wound up quicker though I wouldn't do an intake.