Its true, if your going bike carbs cause they look cool....well... anyone who knows anything about datsuns will think fuel injection is just as cool, and while i have no idea the qaulity of work your capable of, again 72240z is right, its really easy to hack together a carb setup (just look at my car closely lol)
and... cold starts with these carbs sucks, terriable, full choke and gotta let it warm up for like 4 min before you can even move it... if this is for a dd i would re consider efi, but at the same time if your set on the carbs it works just fine.
another thing to consider, i dont know jack about the napz motor your using, but if its anything like my l20... stock l motors dont last long with boost, the cast pistons break, valve guides and seals go pretty quick and if your gunna do it, do it right, low comp, rebuilt head, good pistons etc
just my opinions