G'day and welcome to the forum. Have a look at this thread:
http://www.nissanpatrol.com.au/forum...-Helpful-Hints
there is a picture of an RB30 engine bay.
The Rb30 carby has a heater grid at the base of the carby. I removed mine as it was already disintergrating and bits were getting chewed up by the engine. I got better performance and economy as a bonus. I had to reinstall the preheat flap to help with warming the engine up as I live way down south, but it may not be an issue for you.