you should target an early L28, N42 block/N42 head this would mean you can utilize your stock square port exhaust manifold and you can still use a mechanical pump in it's stock location.
Also assuming you don't use it, the EFI intake manifold that doesn't have an EGR can be sold for a bit of money ($150-$300 latest i seen)
if you wanted to go a bit further, you could swap the pistons for some 280zx flat tops and raise your compression and make a bit more power.