Harmonic Balancer on 283

[LDO]

Was wondering if anyone has seen this type of balancer and crank pulley setup before. I have another 283 that isn't set up this way. The timing tab on this one is welded to the cover and has a O and an A and a few hash marks.

When I was checking to see what my timing was at idle, (had the vac adv plugged) manual trans in neutral, the slit cut into the balancer was about 1.5 inches away from the left most edge of the timing tab. Motor idles nice and smooth, no pinging, no hesitation, starts right up, shuts down properly. Not going to mess with something that appears to work but what I saw with my timing light doesn't make sense.

Am I correct in thinking...
-Looks like the crank is drilled for a center bolt.
-Is the spacer there to make the pulleys line up with such a skinny balancer?
-Do I need the timing tape on this style balancer?







thanks in advance...