Sort of confused by your question, Lindsey. In the YF the distributor vacuum port is right where you're looking (image attached). You may need a brass fitting, but that's where it will be. Just me, but I'd rebuilt the YF nicely and forget about the Rochester. Good luck.
Attachments
MVC-089F.JPG (39.4 KB, 67 downloads)

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end