If you select the year 1997, it wont list the 2462 hkr headers. This is because its desgned for the TBI trucks NOT our Vortec trucks. The 2462 hkt headers have the O2 senor bung ina drivets sode primary tube, while the Vortec trucks use precat O2 sensors.Another difference is the Vortec engines use an EGR feed bung located on teh drivers sode primary tube. The 2462 1hkr DOESNT have thise bung. If you need to retain EGR, then get a bung welded in. I disabled EGR via PCM tuning. NBot difficult at all to retain EGR. I personally have been using teh 2462 1hkr headers for 8 years now on my 1997 rcsb Vortec 350 truck.
Seeing as you want a send opinion I will let other 2462 1hkr users give their opinions.
Those headers will fit your vehicle.
I got mine from Schillings Performance in Guelph. Just down teh 401 from you. I wouldnt steer you wrong. But theres nothing wrong with researching.