Is it just a block, a short block, or a complete new engine? What are your plans for the car? If I had a fairly stock '40 that I was going to drive in a sane manner and I ran across a GOOD deal on a NEW dipper motor I'd grab it. That "babbit beater" thing gets way too much play. I'd look for better rear end gears or an OD trans and drive any where on this continent!