milodon oil pump problems in a 440 duster

yes, you're wrong.(no offense meant..) They look similar, but Schumacher places the ears of the block up and back from where you have them now. that's you problem. Also, the boxed mount looks interesting, but it will add
3/8" to the height of the air cleaner. On an RB A body, that might be an issue. I'd just use a chain/turnbuckle torque strap.