DO NOT ASSUME those marks are correct. the only way to do it right is manually rotate the engine to TDC and see if it lines up. if not then its spun and will spin again and i would invest in a new balancer. by SPUN, that means the outer ring has spun around on the rubber ring and thrown itself off in relation to the hub which is bolted to the crank. old factory balancers tend to do this and its a common problem.
how to find exact TDC get a spark plug stop tool. its a small fitting that threads into the spark plug hole and has an adjustable peg that sticks out, you stick it in there and rotate the engine until the pistons hits the peg. then mark your balancer, then rotate the engine the opposite direction until it hits it again, then mark again, now take those 2 marks and then right in the middle of them is TDC
by the looks of the pic the big long mark is zero, there is a big 0 cast into it under the line. and every mark is 2 degrees. it looks marked like roland said, 0,10,12, and 14. but thats not whats important. what is important is that it lines up right on zero when your engine is on TDC. if not your timing will be off.
I would think when the pistion hits the peg it is at TDC and when you take the those 2 marks and right in the middle of the 2 is BDC
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