I thought there was a 4th gen Fbody parts yard called Billy Graham's or something like that. But the different LT1's used different brackets(Impala, F-body, Corvette). Is his from an F-body? I'll tell you what, it's a pain taking that bracket off and getting the ps pump off as well. I had to do that to the Impala LT1 that was in my old 68 camaro.
Here you go.
Billy Grahams Salvage