I am putting a 302 into a donor car. I am almost done but have a couple of questions regarding connectors. In the attached picture there is a connector (in the red circle) that I have no clue as to where it goes, can someone give me some detailed information to what it connects to. Also, the donor car has been in my garage for 4 years and I have no clue how much gas is in the tank. Should I drop it and clean it out, or is there something I can/should add to the tank? What kind of problems can I expect if I don't clean it out? Also is there a diagram that shows where all the ground connectors go? I have about, what appears to be, 3 or 4 wires that look like they should be ground wires. Thanks...