Re: nozzle location
I'd go direct port and place the nozzle close to the fuel injector, ideally right in front of them. Direct port works best if the spray does not have to take any turns. Always fit the nozzle on the same side as the injectors, otherwise most of the spray will only wet a part of the cylinder volume.
If you don't go direct port, things get more complicated. I'd propose you post pictures of the engine bay so we can see the inlet geometry.
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