Heads? A good first mod

Yes, heads would be a great first mod! Although if you are going through with the head install, you might as well throw a better cam in there to utilize the better flowing heads and bigger valves. And then there is the intake manifold. It's when you get the better flowing heads, cam & intake that your car will REALLY wake up! But if you didn't want to spend all the money at once, just do the heads and cam first. You could always swap the intake later. AFR has the best heads out there right now, IMO. But TFS & Edelbrock are great flowing heads too. Let us know what you end up doing.