I'm with Duece Roadster re thinking about brakes so that you can stop ... but even go further (well tuned mechanicals are excellent brakes as are later hydraulic) - but these early Fords are not designed to stop fast no matter what brakes you have ... skinny tires and high speed just mean locking up the brakes and at 70mph so you will need a long runway to stop.
I learned this lesson with my 296cu Flathead powered 39 Coupe with a Columbia and remember it every time I drive an early Ford - you can not compete with modern high speed traffic and modern cars that stop on a dime with drivers that have no clue or respect for what we are driving.
