Timing chain confusion.

[Kalums]

Ok I've read a couple of threads on here about swapping timing chains and... I'm thoroughly confused. Maybe I'm just not getting it, but are my timing marks supposed to be at the 12 and 12 position(s) OR are they supposed to be Cam mark at 6 o'clock and crank at 12 o'clock? I have found my TDC (compression stroke) and my "timing mark" and rotor are both off... And not equally. Also for a stock 350 should I get a Cloyes #C3001K or a #C3023K (or X)? I really don't want to spend hours grinding on the block. 3rd and 4th questions, suggestions on harmonic balancer (one of my current issues is because the rubber ring has deteriorated and the balancer moved) and or water pump (might as well do it while it is off already)? All I'm finding near me are Dorman parts with different sellers part #s.

Btw stock 71 350, no mods, picture is of what was supposed to be TDC... But definitely is not😩

As a side note should I re-align my distributor while I'm at this (provided it is still "off" after doing the timing set?