Sorry, missed this until now. So when I bought it, the front end of the engine had been swapped to a 70-up timing cover, water pump, and aluminum aftermarket pulleys, and the Fluidamper had a flat face where the pulley bolts up. I think the belt was ok but didn't run this for long. I removed all that and installed the 69 timing cover, a Milodon (IIRC) cast iron water pump, what I believe to be the correct factory pulleys, and added power steering. With that, the crank pulley stuck out too far, so I bought a new Fluidamper which has a recessed area where the pulley bolts up. I think it's 1/8 but it's been about 10 years so...the alternator brackets are repops also. I did have to add shims behind the water pump pulley and tweak the alternator spacers a bit but eventually everything lined up well. Not sure how much to attribute to the damper vs other non stock parts. Hope this long winded post helps!