11.75 B body brake Q's

im looking to do the 11.75 brake upgrade and use the mancini brackets for wilwood calipers.

couple q's...

what year did the b bodies start using the 11.75 discs

did all b bodies use them in those years

can i use my 73 disc a body spindles and those rotors?

lastly are the b body spindles a direct swap over to a BBJ a body?

thanks!