[19Fordy]

Do you think it would be ok to pour a pint of gasolene down the oil fill tube on an 8BA engine after your drain the oil (and before you reinstall the drain plug) so that the gas would help remove sludge that may be in the engine or oil pan?
Then refill with fresh oil.

Here's another idea. Weld a larger nut to your drain plug and label it so it's easy to see what size wrench is needed and easier to remove.

Of course you don't do this on AACA restorations.