Got these in the mail today....

[Right on the Mark]

i have what looks like about the same underdrive pully set and its not a piggyback? you remove the harmonic balancer. i have had these on for 2 plus yrs and no issues with them or oil gears .
no slippage for belt either.

I see no dampening in that crank pulley. That would make it just a hub. Is that what you have? Even if it is dampened they 100% do not recommend the smaller dia crank dampers. What do you spin your engine to? 6500 or 7000?