Re: Crankshaft TDC dot
0 would be the keyway without a mark in that case. put it on that keyway, install the chain bring it to TDC on #1 or #6, drop lifters into the bores. depending on wheter it's 1 or 6, both lifeters should be all the down and the other two should be up off the base circles but those lifters should at the same height or very close.
Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.