A Few Questions

I Have A Stock 71 360 With J Heads. Ld340 Intake, 625 Carter, 455 Purpleshaft With Stock Rockers And Springs. And A Cheap Set Of Headers. My Questions Are What Can I Do To Get More Power, Is There A Way To Up Compression Without Changing Pistons, Should I Try A New Intake That Would Flow Better. I Was Looking At Hughes Musclecar Cams Also, Maybe Port The Heads A Little. Oh By The Way Did I Mention That I Am On A Budget.
Any Suggestions Are Very Appreciated