How do I rotate crankshaft to TDC marks with a broken valve?

I'm trying to remove the head and need to line up the TDC marks by rotating the crankshaft. But since I have a broken/bent valve, I cannot turn the crankshaft nut because the motor wont turn. The nut just loosens up, it wont rotate the motor to the marks. Is there any other way to line up the marks?

If its coming apart don't worry about TDC. Just need to worry about TDC when it's going together.

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