b16 block with gsr p72 head

[drewdawg07]

I have a b16 block from a 1999 civic si it has a p72 gsr head on it. Which engine harness do i need for the motor a si harness or gsr harness, i want everything to function properly and look nice under the hood

 

[OKCZombie]

...either harness will work - is it an obd1 or obd2 head? guessing obd2

 

[drewdawg07]

so it is a obd2 so either harness will work what about modifications