Thanks for all the great advice, and i will be sure to refer to the links.
I plan on running from a jerry can full of clean non-ethanol gas on start up until i have a chance to look inside the tank, for now it has been flushed a bit with clean fuel.
In the pictures below, the numbers on the parts are as follows:
I hope I haven't broken the cardinal rule of "Know what your working on!". I assumed that this was a 235 due to the side cover, and year of the truck, but have not been able to 100% confirm as its a Canadian truck, and I haven't been able to find much info on it.