Funny you asked this question...I purchased a negative battery cable for the S-I-L's Caprice. It too had a/c and was removed some time ago. When I went to put the new OEM style cable on the battery it was too short. I went and bought a '67 Impala non-a/c cable for 396 from Impala Bob's He was the only one who had them in stock. CI is out of stock.
I was looking at the American Autowire site last night and I believe there was a Neg. cable for a 64 SB w/o air on there. The cables are all $50.
Yes, it goes to the top water pump stud. But like Big Dave said, any clean block hole will work.
'68 CJ-5 - Sold