Dave,
I enjoy watching this project get built and appreciate being able to follow along - it's looking great. As an engineer, something caught my eye...
On a four link, all the force driving the car forward comes through the lower links (those are in compression) while the upper links are in tension. The lower four link brackets in their current configuration are cantilevered in two directions - horizontally inward, then hanging down. The suspension will be trying to "twist" that bracket off the frame rail anytime power is applied.
Can you tie those into the crossmember in front of it, gusset them to the frame rail, or run a continuous crossmember across the frame rails there? That is one of the most stressed areas on a chassis - right now it is the most flexible portion of that frame section.
I attached a picture of a Chevy II four link conversion with how the subframe connector gets tied into the LCA bracket - if you could do that to the large crossmember tube, it would help a lot. Just my 0.02...
Luke
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'68 H/O W45
'70 Cuda
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