Both engines have the same injectors and dual fuel pumps. However, they max out around 65 psi. The fuel pumps are controlled by a module that increases fuel pressure in relation to boost. There are aftermarket pumps and voltage controllers that will work with the factory ECM to increase capacity.
The factory heads are based on the LS3 heads. However, they have a flow vane in the intake port. This helps emissions and idle stability, but reduces flow. CNC porting the heads is common. This removes the vane and improves airflow by about 70 cfm. Aftermarket cylinder heads are another option. These heads will flow even better than ported stock heads and have thicker deck surfaces to withstand more boost.
More importantly, the video will show some simple tests you can do to make sure your mass airflow sensor is the cause of your problem, so you don’t waste money by replacing perfectly good parts. Think because your engine is fuel injected you don’t need to worry about heat causing you problems and stealing horsepower?
I was told I could have a custom computer chip burned so I could run TPI fuel injection on the 350. The EFI system will be modified with an Edelbrock High-Flow base manifold and runners, ported stock plenum, 52mm throttle body, bigger injectors, and an adjustable fuel pressure regulator. I will be using 1-5/8-inch headers and a 3-inch dual exhaust.