Upper Ball Joint Question
See what happens when you trust a parts listing.... I've dealt with a apparently early 73 that had the small ball joints...No.
All UCA's 73+ are the large ball joint style regardless of bolt pattern. The spindles and the brakes changed. 9" drums in the front also went away. Only the first few months of '73 production were different, by November '72 the changeover to the new 73+ drums was finished. So, large ball joints, small bolt pattern 10" drums.
https://www.hamtramck-historical.com/images/TSBs/1973/05-03-73C page1.jpg
Like RRR said, if it has the factory UCA's and brakes it should be the smaller upper ball joint. But a lot can happen in 55 years.