economy combo?

[Unit 5302]

I am unfamiliar with your combo, you should add the entire setup to your sig, or list it so you can be advised better.

No cam should be added to the stock heads.

Porting the stock heads is an inefficient use of money unless you are trying to build a sleeper or run in a stock class that forbids other heads.

The RPM intake is way overkill.

I would suggest saving your money until you can afford a set of better heads, and a different intake. It's hard to save, but doing it right the first time will pay off.