Welcome to the L78 Nova family
There are some folks out there who can help repair the pump if needed..Bill Hodel comes to mind...and there are probably a few more. I would double check to be sure the pulley is securely fastened..maybe the attaching bolts are loose??
Also, the smog pumps can be 'modified' so that they don't function...but, give the appearance of working...just another option.
Regarding your question about the smog being original...all 1969 L78 Novas had the smog system...no exceptions.
Please post some photos...
-wilma