not sure about the 3rd line on yours. i'm swapping an LS1 from a camaro into my truck & if i remember right the third line i have goes to the radiator hose. i'm not to that part of my swap yet.

you can remove the evap but you'll have to have it removed from the ECU when you get it tuned.

i went a different route with my oil & temp sensor. i bought a single wire plug for the LS1 oil pressure sensor & a 3 pin coolant temp sensor with a a harness so i only have the one sensor.
you can check them out in my build thread. http://www.ls1truck.com/forums/my-ga...gondown-3.html

dip stick tube should have an o-ring. i'd try some needle nose & try to bend the tube so you can grab it & try to pull it out with the needle nose. or you should be able to drop the pan & push it out from the inside.