TTI HEADER VS P/S BOX
I did the same but IIRC .25 on one side, .375 on the other to level the carb pad, and to get the pitmam arm under the tubes. As it was, the trimmed pin has been occasionally rubbing for lo these many years since 1999, lol.
Mine's a 68, with a 70 Duster K, 71 demon brakes, 73 Dart steering, yadayadayada.