your car is obd2b
you have two choices:
#1
2000 LS swap, also obd2b
civics went to 2b in 99, tegs didn't until 2000.
however, 2b ecu's have imobilizers built into the ECU's. so unles syou feel like swappign ingition shit,
#2
99 ls swap
obd2a
use civic harness. lengthen wires/ swap dizzy plugs
get an obd2b ->2b conversion harness so you can plug the 2a ecu into your 2b harness