First, buy a book. You'll need the wiring diagrams anyway. TRUST ME. I'm assuming that you're already in there and are having trouble with reassembly. on a single cam car, I don't remember. I think there's a timing mark on the back side of the cam cover to line up on the pulley. Twin cam is my specialty. Just had mine apart tonight. There is a timing mark on each of the cam gears. They should point towards each other in the middle. DO NOT ROTATE THE CAMS WITH THE CRANK MARKS LINED UP!!! The crank is just an arrow to arrow kind of thing. If you intend to rotate the camshafts, then rotate the crank COUNTER CLOCKWISE THREE TEETH. this eliminates the possibility of piston to valve contact. I use a straight edge on the cams. Line it across the mid section of the cam bolts and then use an 18mm wrench to align the camshafts. Put the belt on them to keep them aligned with each other, then work on the crank. Patience is required. I can have it stripped down, new belt on, and back together in less than 3 HRS. I spend at least a half hour of that playing with the timing, and getting it RIGHT. Remember, one tooth on the cam is 20.5 crank degrees. It can only handle 15 before you smash a valve either into another valve, or the piston. After it's all lined up, put about 16-20 Ft/Lbs of torque on the bolt in the center of the tensioner pulley, slide the preloaded tensioner against it, and lock it down. Assembly is reverse of removal. (I've always wanted to say that)... LUCK