will 16x7 +38 clear 300zx front brakes? or will i need spacers? if so how big of a spacer do i need?
thanks,
jon
Depends on two things: Offset and more importantly, spoke design
Mount the wheel on with your stock brakes. See how much space is
between the spoke and stock calipers. I’d say 2-fingers or more and
you’re OK. Also depends on how chubby your fingers are though. 
my old te37’s were 16x7 +38 and fit with room to spare, but like gonad said spoke design will matter the most.
Offset really plays no part… sometimes it can indicate the directions teh spokes take from the mounting surface, but other than that it tells you nothing. Spoke design is all that matters.
those are the rims. spoke as in how deep they go ?
and i’ll try and see if i can fit 2 fingers when i get a chance to put them on.