When I was selling cars in the early 80's at Cutter Ford.
I sold Mustangs with the V8 to officers, the Turbo 2.3 was offered but HPD had to have V-8 power.
Here is the link to Hawaii county Police Regs the cars are V-8 or Largest 6.
http://www.hawaiipolice.com/genOrders/go802.html