Your hood is similar to my '37. Best way I could see to hold it is to figure out how to get a bungee to hook the hood levers on each side and pull down under engine. If you try and go out over the fenders, the hood sides will flap in the wind. At a show once, someone unlatched my left hood when I wasn't around, I hit the highway without knowing it and the hood came flying open. Lucky no paint damage, I do a walk around when I leave it now. You could reach up from underneath and hook the inside of the hood latch mechanism with bungees.
Can't recommend going over the top!
