Things that I do remember from my Vortec builds:

Cranks on ALL Vortec motors (96 and up) are 1 pc rear main seal
Front of crank has slip on reluctor wheel for CPK (crank position sensor)
Front of crank accepts standard type balancer

Cam has NO fuel pump lobe on Vortec
Vortecs are all roller lifters
Vortec heads do not guide the pushrods, the rocker arms are have the slot that rides on the valve tip
The distributor drive gear looks normal

mike in tucson