i have a 90 gs, swapping in an obd1 gsr longblock

i am using my stock harness

extending wires for coolant temp sensor to reach thermostat housing as the sensor on my a1 is on the back of the block

also using my obd0 distributor, cutting extra leg obviously, since gsr distributor will not plug in directly

question

considering gsr injectors and ls injectors have a same flow rate of 240 i was considering using my ls injectors since they will plug in directly

last question

should i have my p28 chipped

or get a pr3 obd0?

which is more expensive and will the pr3 integrate with my chassis harness to plug directly in?

or would it be wiser to use the p28 chipped for vtec so i can easily plug the chassis harness in and just add wires for vtec