Aftermarket alternator mounting bracket for 1970 340

I wouldnt blame the brackets you purchased just yet, the onus is on you to know what year of parts you have to start with. I realize its frustrating. Got links/part #'s?
Your w/p is 70 and up. Are your heads oem? Did you order 70+ brackets?
The engine is a 70 model with original cast iron "O" heads and aluminum water pump. Ordered bracket accordingly to fit 70 or later with aluminum water pump. As stated earlier, brackets came from Mancini and 521. Just ordered bracket set from Bouchillon. Will see what they can do. Next will modify bad bracket as suggested. Cut to match, beat to fit and paint to hide.............