I have some idear, but you should get a mechanic to do this part for you. There are notches in the camshafts and they should all be facing up when the crank is on TDC. But get a meachanic, because you could get mixed up between intake and exhaust cams. They are interchangable, but the timing mark is different.
If you have reground cams, this should be properly timed in with a degree wheel, not relighing on the marks.