I installed a 40 dash in my 39 tudor in 1953. The 39 instruments were stored in the trunk. I sold the car when I was in the military and found it forty years later. When I opened the trunk the 39 dash instruments were still where they were stored when the car was sold.
When I installed a 40 dash in my 39 sixty years ago I made some kind of bracket to hold the windshield tight. I haven'ted at it since as it still keeps the water out.
Fifty years ago I put a 40 standard dash in my 39 deluxe. It fit with minimum mods. I still have the car and the dash has remained. t causes discussions at car shows.