as far as I know and remember, it’s the same pan that came with the motor when I bought it. That’s not saying it was the correct oil pan. This one has a visible hump at the front which is where the pan and K Frame wants to share the same real estate. Referring to Ulf’s pictures of his 273 pans, they are straight across the front.
Other than the oil pan, my block is empty to keep the weight down