These injectors have small tubes that actually run inside the airflow path. The 96-99 5.0 and 5.7 use 19 lb/hr injectors which are housed inside the intake manifold, not ouside like a TPI or the newer LS1 style engines.
The 350 Vortec is RPO(regular production order) 元1 and the 305 is 元0.
I found this which tells me all about the 5.7 vortec.
