In good condition that original suspension will be just fine. Its the same design as a number of modern vehicles. That same basic design was used by Chevy through '59 on pickups.

I looked at a brand new motor home a week ago that has leaf springs and a straight axle front suspension. If you look around you'll notice that larger trucks have gone back to straight axles after some years using an IFS. The owner of the motorhome bragged how nice it goes down the road.

A Camaro clip will be too wide under your '39 so its not a good choice. The Mustang II approach is probably better than most the other IFS options, though exactly what you mean by putt around might drive toward one decision over another.

I just hate to see you toss the original suspension when its likely it will satisfy what you want if worn parts are repaired or replaced.

1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...