Like Sig'600 does, I've always used the drop-valve method of finding TDC and I think it'll get you to within an half degree or better if done carefully.
-Jay
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'98 2500 12V 5spd 4X4 QC LB. custom plate, DDP4's, timing: 18.5*, compound spinners, PDR cam, PDR ported head, 3K GSK, SB DD, etc.
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