Matey, I don't know why you are worried.. Nobody has argued or harrassed you.

For your A15, if it's running hot, Is the engine "pinging"? (making death rattle noises) when under load? Have you checked the ignition timing?

Are you using the Datsun or Suzuki Temperature sender? I recommend that you buy/make an adapter and use the original Suzuki one.

Have you checked the thermostat? For $10, please replace it. Is the suzuki radiator the same size as a datsun one? Maybe it's not big enough. Are you using a electric or crank driven radiator fan?

Does it get hot at idle, or after highway driving?

Tell us some more.
Chris