Wow, I cannot even keep track of all the suggested answers to the Front Suspension Question! So I'll have to generalize a little:
(This all to the best of my understanding, ya know.)
There is nothing wrong with the way the spring is mounted. And it does have a center pin thru the leaves and into the plates. The cross spring clamped firmly in the middle is indeed how Henry Ford built them for several decades. There is no harm in having the spring behind the axle -- this only changes the spring rate a bit, which I toyed with by removing leaves anyway. (Only 900 pounds on the front tires, dripping wet.) The shackles are at a good angle (roughly 45 degrees), allowing full travel without alowing excessive sideways movement. There are plastic bushings in the shackles, allowing for the inevitable wiggling -- and the spring leaves can also twist just as well as they can bend. (The dampers -- "shock absorbers" -- are absent in the picture, in case you wondered. Normal modern tubular dampers between the tabs on top of the frame and the wishbone.)
The problem is that I installed split wishbones with a TUBE axle. Recall the fact that the entire suspension is designed to roll around the middle of the spring. The wishbone, as designed by Henry, also pivots on the center line, at a ball below the transmission. Thus, the axle and wishbone live as a single firm unit, just rocking from side to side together. When we split the wishbone (for powertrain clearance and/or handling improvement), we change all that. The axle and the split bones become effectively an anti-roll bar. This requires the axle to twist. With a beam axle, this works great. An I beam loves to twist. Round tubing not so. In fact, any box structure is very resistant to twisting, and a round "box" the most so -- think drive shaft. So, sooner or later, metal fatigue will win. Most likely, one of the wish bone mounts will break, and the axle could even snap. This axle is a very light weight unit, plus it is weakened/embrittled by the chemical/metallurgical effect of plating, so I have been watching it for cracks in the chrome. (None yet.)
This Split Wishbone Catastrophic Failure Problem is most commonly seen on rear suspensions. Usually, a "hair pin" mount tears out of the frame. (Countless T-buckets have been pushed behind the barn one last time in frustration over this problem.) Ever tried to twist a four inch diameter rear end housing?! Something has to give. On a suspension with two lengthwise springs, the springs yield happily enough -- into a slight S-shape, one might say.
When splitting wishbones with a tube axle, the absolute minimum amount of split should be used -- just enough for the drive shaft to pass thru.
The "Four Bar" suspension was invented to solve the axle twisting problem and it works well.
Much good thinking guys, but no cigar.
I'm gonna get some sleep now.