[Blue-S]

If the #2 & 3 pistons are currently at TDC (and I think they are), then you need to turn the crankshaft FIRST. After verifying that cylinders #2 & 3 are at Top Dead Center, turn the crankshaft carefully CLOCKWISE until the crankshaft is about 3 teeth on the timing sprocket BEFORE the timing mark lines up (#1 & 4 TDC). As you do this, the #2 & 3 pistons will be going DOWN and the #1 & 2 pistons will be coming UP. With the pistons below deck, you can turn both cams without worrying that a piston will whack a valve. Next, turn both camshafts counter-clockwise 90 degrees to line up their timing marks with their pointers. If you want to be really slick, put a wrench on each cam bolt and SIMULTANEOUSLY turn both cams back to line up the marks.