DoraDidIt

Okay so long story short i have a 95 dx coupe with jdm sohc d16zc and s20 si trans. Im looking at getting a 91 lx sedan. The b2 in the ef has a burnt valve so I plan on just dropping the zc in and keeping the lx trans (s20 has 3rd gear grind, trans in ef is fairly rebuilt w/ new clutch, bearings, pressure plate) sounds easy enough but its raised the following questions:
Can I run the zc as obd0?
Should I keep it dpfi?
Which ecu/harness do I use? stock vs si?
What should I do about the ps rack? zc has no ps pump, I think I might cut the lines and vent the rack
Or should I forget all this and just rebuild the b2?

I'm sure ill come up with more as I go along but any help is appreciated, Thanks VADRIVEN!