Mine has been off the mark as well and when it was running didn't have any issues.
I am putting my engine back together this weekend and I'll let you know if the mark stays in the window. But I have found on a few SVTs that I have done the Timing Belt on, that it doesn't stay exactly there.
Hatch Nation Member: #147
R.I.P - FELLOW FF MEMBER, IZZY, BLK2k3GTS, will always be remembered. We will compete on a different course again one day.