sooner,
I am not a 39 owner... I'm a 1940 ownwer. As for the suspension I'm leaving mine mostly stock. I am going to try a couple of twists.
I will be using a 41-54 front axle that has been dropped 2 1/2 inches. Modern tie rod ends, possibly a beefier tie rod. 12 inch 6 lug disc brakes, front and rear. The rear is an IMCA modified full floating 9 inch with 4.11 gears, 31 spline axles and posi. I will be using a 41-46 steering column as they bolt in and offer a recirculator ball system which makes the steering eazier. I am toying with the idea of tube shocks and sway bars, but haven't decided on those yet.
I am shooting for an old truck, that still looks like an old truck. I want it to be able to carry a load if needed. I want to improve it's mannors and stopping ability, but not to the extent that it becomes useless for doing work. I have no interest in a MII or camaro or any other suspension swaps. I like the feel of an old truck. If I wanted a MII, I would buy one.
That of course is what I am doing, and my opinions. It may not be the same as others, but we all get to do what we like.
John