Do you know the specs of this cam?
There are so many good off the shelf cams available that one will be very close.
If you do not know the specs you could find out the specs using your block and a degree wheel+ dial indicator or run the cam on a cam doctor.
Critical specs are duration @.020" duration @.050" duration @.200"
peak lobe lift, Lobe separation angle, intake valve closing point @.050" lifter rise. Rocker ratio and valve lash. With this information, I bet you can get a $270 to $350 off the shelf replacement that will make within 98% +/- power and torque.
A junk or defective harmonic balancer will also casue excessive distributor gear wear.