What do you think? Does my Valiant need a Hood Scoop?

Go with the snorkle. As per the DC race manual Mopar states its the most efficient Scoop of Its time. Same as the the T/A Challenger hood. and SixPack Bee hood but its a bolt on and its not a parachute trying to pull the hood off. Its application can be made to look clean as if it belongs there. On your car? I think Body color would look cool even if your leaving the fenders flat black which I think looks pretty good on your car.