440 harmonic balancer removal

taking off timing cover to replace with bigger cam. In removing small bolts that hold pulleys on, crank is turning. got pullys off, now I need to find a 1-1/4 socket..but this is a 440 car with a 727 since crank was turning in removing pullys how do I hold crank while trying to remove crank bolt which manual sez in on @135 lb ft ttorque...anybody? thanx