So here is a new approach I'm exploring allow the front suspension upgrade:
The roadblock that I ran into is that there are no lower control arms with balljoints that I have found that match the dimensions of my '37 Buick Roadmaster (see sketch). The wiki is focused on coupes that have 18" lower arms.
I have considered having a balljoint mount plate welded onto the existing arm.
I have considered making a transition plate that is bolted, or welded, to the frame to attach a shorter arm (probably a Chevy C10 truck lower arm).
Another option may be to have a custom lower control arm built that matches the current geometry.
1) Does anyone have a company they would recommend to build a custom lower control arm?
2) Which approach do you all think will have the best results.