ERA427 -- look, here's a picture of my 428 block and I've circled in yellow where to look. Now I have a remote
oil filter, so I have that pretty fitting with the blue and red stainless lines coming out from where an
oil filter mounting would normally be. But that's where you should look. I think Bill's message might confuse you, so just look where I've circled and you'll find it. Driver's side, front of the block... if it was a snake, it'd bite 'cha.