Hey guys, could use a little advice. About a month or so ago I replaced the plugs and wires on my truck. 69 Ford F250, 360 motor. After changing the plugs to Bosch Platinums I noticed the idle got a little rough, when I say a little rough, I mean not rough like it has a miss. So I figured I'd check the timing, I looked on the balancer to make a timing mark and the previous owner had one, at 10 o BTDC, the book says 6, so I figured what the heck, I'll throw a light on and see what happens, turns out the mark the previous owner made doesn't line up with the pointer, my question is, is there anyway to tell what my timing is actually at? Or should I just set the timing to 10 o BTDC and see if it clears my idle problems up. Thanks in advance for all help.