It looks like you have the same Nismo 740ccs that I do. I just practice soldered a couple of joints since it's been a while since I've had the iron out. I'll be doing the real thing tomorrow evening. As a warning for you I had an interference between the front passenger injector connector (cylinder #1 I believe) and the extension on the intake where the throttle linkage attaches. I had to grind on the manifold and trim down the connector some to be able to plug it on.
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90 300zx TT 13.285@106.08 94 Camaro Z28 13.751@101.83 03 WRX 13.973@94.88 02 Mazda MPV; four kids and a wife don't fit in the Z. 90 240sx (sold) 16.9@87