Installing a new charcoal cannister in 85 5.0. Working from scratch so I cannot simply unplug the old and plug in the new. The two large holes at the top are 3/4 inch, the lower left is 1/4 and the lower right is 3/8 inch. I am fairly sure that one of the 3/4 openings goes up to the air cleaner but unsure which opening is for the fuel line running to the tank etc.