MAF and CAM codes?

A friend of mine picked up this $300.00 car. It starts right up only when the MAF sensor harness is off. Also found another MAF in a box in the trunk. I am guessing people have changed it thinking it is the MAF. With 200,000 I am sure there are vacuum leaks affecting it, so I am going to run a smoke test. So, he has two codes, 8 and 65. Can you tell me where the camshaft sensor is so I can check the harness first? Also, when I connect the MAF sensor car turns off, we tried both MAF sensors. Remove the boot that goes from the MAF housing to the throttle body, and it was a bit twisted and not completely right so I fixed it. But this boot has an extension underneath the boot. I cannot figure out where it goes. It's about 4-5 inches long, a thick vacuum hose that is about an inch in diameter, plugs into the boot but I do not see where the other end goes to. Can you help with that please? Codes are 8 and 65.