I finally just took off the hood hinge springs and it made all the difference. So I just carry a hood prop. I know that it's cheating, but the hood now fits. Just a thought.
On our '41 had sort of same problem. Installed NOS hinges, springs but my hood sides spread apart at the cowl but good at top of cowl. After fighting it forever I removed the springs and bingo! fit perfectly everywhere. Installed a fold down hood prop similar to modern cars.I finally just took off the hood hinge springs and it made all the difference. So I just carry a hood prop. I know that it's cheating, but the hood now fits. Just a thought.