Gen I 3100 Intakes (LG5) to 3400?

[turbobuick88]

I have right now a LG5 3100 but would later would like to swap in a 3400, 3500 or 3900 but still use my LG5 upper intake. What lower intake would I need to use? Would this be posible to do? Also I was wondering what years of 3400 used the crank positioning sensor on the side of the block. THANKS!

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[SappySE107]

Gen 2, and we don't call those 3100s. 3100 say 3100 SFI on them, and are Gen 3 motors. You cannot put that manifold on any 3100, 3400, 3500, or 3900. All 3400s have the same crank position sensor setup as your current motor.