Re: 2000 Vortec engine
As long as it has the plastic upper intake then yes. IIRC the L35 still existed up until 99 or 00 but would have the same "vortec" labeling on it as the other motors.
The simplest way to check is look at the intake bolt pattern. Our trucks use 6 bolts per side, with the center 2 staggered. The vortec heads use only 4 bolts on the outside