hey mate, the NA block does not have the mounts for oil squirters so you can either run without them or get a RB25DET block which you can pick up cheap occasionally.
As your head is coming off, you will need new head studs, so get some ARP items - do not reuse your old ones.
since the head is already off, get oil restrictors installed and a head drain kit as we all know RBs have issues with returning oil from the head to the sump.
Stock rods are fine but if you want a cheap upgrade then get GTR rods and fit ARP bolts to them.
take your crank to a crank specialist and get them to check it out, it may or may not need to be polished depending on its condition.
if u got the dosh, get a greddy plenum, makes the engine bay look so much better and the shorter piping means better response.
as for the oil pumps; de and det both bolt up, but Nissan list different part #s for both motors so i assume they are different.
why not fit a N1 item along with a crank collar to your crank for added peace of mind?
collar $100
$200-$350 to fit & balance
gl mate, post up a build thread