Four things that I tried over the years:
1. Two pieces of slip-on, chrome, door edge-type moulding placed on the rear (sharp) edge of the hood so the edge "rolls" over the cowl. This worked on my gray '51 HJ
2. Adjust the hood so it is as far away from the cowl as possible.
3. Slip thin rubber shims between the rear edge of the hood and the rear-most support bracket in an attempt to raise the offending edge of the hood just enough to clear the cowl without making contact.
4. Some for the older gents in the 1980's were sold on the double spring technique. A sort of spring-in-a-spring approach - like an accelerator pedal return spring.