my 460 has the same set up as this one. I need the ac compressor bracket. does anyone have any idea what vehicle this style 460 came from?

 

GM A6 compressor. Could be T-Bird or Lincoln
Here's the illustration from the parts catalog, says 73-76 T-Bird and 75-78 full size Ford.

 

"Swash plate" GM type A/C compressor: 1973/76 Thunderbird same as Lincoln Continental Mark IV / 1975/78: LTD same as Mercury Grand Marquis & Lincoln Town Car.

Some 1977/78 Lincoln Town Cars could also have 400's. No 460's in Passenger Cars after 1978.