I recently picked up this 64 Jetstar88. I think I have researched myself stupid if that makes sense. I have hit the search bar looking for what booster to run and it seemes as though what has been recommended I can't get. I don't have anyone locally that rebuilds them but a friend who works at an O'Reilly hub store who said i could come look around. Just thought if I had some leads it would help the search.
I'm also in the hunt for some hood letters and door window seal suggestions. Glad to be on the site thanks all

 

Congrats on your first post. I would call Karp's Power Brakes. He can tell you what you need. He is a rebuilder but has a number of units in stock. Good guy and does great work. Here is a link to his website. Home - KARPS POWER BRAKE SERVICE & CYLINDER SLEEVING Nice looking car

 

As far as door seals.
The Jetstar 88 has a "B" body, the same as Chevy Impala.
Places like Classic Industries or Hubbards Impala Parts will have them.
Door and window seals are the same as a comparable body style Impala.
Impala Parts Catalog | Classic Industries
Chevrolet Impala Parts (1958-76) for Restoration, Styling and Performance Upgrades including Caprice

Hood letters come up on E-Bay occasionally.
Nobody re-produces them.

 

I had Harmon Classic Brakes rebuild mine. I haven't installed yet but it looks great and was a quick turnaround.