So I could use a switch from a 68-70 Road Runner or Coronet (or any b-body in those years) and just swap the vacuum assembly onto the new switch?

1969 Nova
454/M21/3.31
Mild mid-11 second weekend cruiser

1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)