Next step forward for my engine

So sitting around thinking of what else I can spend money on that I dont have, during this winter. I was wondering about engine upgrades. Wondering what would be the next step for some added power. Im also curious what you guys think my current engine makes for horsepower.

Here is my current set up

LA 360. .030 over
Magnum Heads
XE268H cam
Keith Black pistons (sorry dont remember which ones off the top of my head)
Stock crank and rods
Air Gap
QFT 750
TTI's

So with out major modifications such as complete tear down, and machine work. Are there any other options that would make sense with my engine to get some more power out of my engine. Such as different heads or cam etc...

If not, just tell me that is about it or what not.. I dont want to spend a bunch of money (that I dont have) on something that would only gain me a little bit with this engine but would gain me a lot with a different engine (such as stroked). If that makes sense. Thanks everyone..