i just picked this piece up from hondo jim. question is, this replaces the harmonic balancer, right? i've got a stock steel crank this is going on and i dont know if this is for an aftermarket internal balance crank. i dont need the harmonic balancer, as in there is no pulleys off of it. i see the crank has to be machined for the extra keyway. just making sure i can bolt this on and go. thanks, mike.