ok first suggestion
200b/240k struts, or shortened stanza ones (need the girlock equipt struts, or in the case of the 240k sumitomo equipt ones)
with either 200b or 240k slotted 253mm discs
and corrona or 240k twin piston sumitomo calipers with decend pads
then use just an 11/16th unboosted mastercylinder

its all straight bolt on to those struts and they are great brakes for A series

calipers are around $30-50 from the wreckers, rebuild kits for the calipers are $33 for the pair

discs, dont know what they are brand new, but you could always just hunt down some stock ones and get them machined

struts, depends on what the wreckers charge and you will need to change the spring perch on the 200b and 240k struts to the smaller perch
or use stanza struts and get them cut down to suit 240z inserts