remote oil filter fittings tapped right into the block UPDATE in post 58 and the whole idea got 86ed

So the Canton plate still leaks? That's a bummer. Plenty of people have tapped the hole on the oil filter boss. I think you only have to tap one. The center one is already threaded. Have you had that area magnafluxed? I would almost suspect a crack at this point......not trying to give you an omen.