Removing 7 1/4 bbp axels

Hi! I,m trying to remove 7 1/4 bbp axels from a 73 318,swinger.I punched the little pin in,now the bigger pin has a slot for flat head screwdriver.Does this have threads or can it be punched out?Also will these axels fit a 1966 7 1/4 rear?I want to switch because the 73,s are bbp.(to fit 14 inch rallys).i,m also switching front to disc. bbp.I have stripped everything from donar car,here,s a list.If i missed something please let me know thanks.
upper control arms
SPINDLES AND CALIPERS
ROTORS
MSTR CYL. AND ROD
proportioning valve.

thanks for any help in advance!