How to tell which setup to use?

[awolfe]

I'm a little confused about a section of the L28 motor, I currently own a '77 & '78 280z (just bought in very nice condition). I know there are slight differences between the two years, but have found multiple FSM's for both years showing 2 different variations. Can anyone tell me which one is the correct setup for both years?

Thanks

Diagram1.pdf

Diagram2.pdf

[sblake01]

My 78 had the 'Diagram2' setup.

[FastWoman]

As far as I'm aware, there's only one official Datsun publication per year. The '77 and '78 are very similar, and I don't think the differences have much functional consequence, but there are certainly a few things they changed. Anyway, the Diagram 2 looks like my '78 with regard to the air regulator plumbing.