If I had 427 Ford Side Oiler Block, I would have a tough time chancing it. I think I would strip it down and clean every last inch, and that includes anything that
oil flowed through (remote filter, and
oil cooler, and lines).
If you want to chance it. Drop the pan, you may want to inspect it with a magnet and see what you find. Likewise you might want to properly cut (not saw) the
oil filter and see what is in it. You can wash the top of the engine down into the pan with Kerosene or buy a gallon of liquid WD-40, which is mostly Kerosene. Then flush out all oil ports with Kerosene. When it is perfectly clean of all grit, then flush it all down again with oil. By the time you do all this, you will likely wish you pulled it.