First, Correction: "For "C" and "D" I redesigned the front uprights from a forward spindle design to a trailing spindle design."
Should be: For "C" and "D" I redesigned the front uprights from a trailing spindle design to a forward spindle design." Sorry, it's been a while.
I haven't measured the space between the mounting tabs for the lower control arm bushings so I really don't know how much the bushings can be offset forward. I suspect not very much. I don't know if anyone ever made and sold offset bushings. It's likely a DIY project.
I designed custom upper control arms and modified the lower arms to facilitate the desired results. I avoid modifying anything welded to the body like the mounting tabs. The car will likely outlive me and someone down the line might want to install the factory arms, which I have.
Doug, My very crude sketches are only intended to illustrate a few basic concepts and options. Someone would need detailed dimensioned drawings of the entire chassis to plot out and accurately predict the outcome from changes. Curves need to be generated from full bump to full droop and from lock to lock. (center part of the curves count most). Being a dynamic system, all this data must be generated for most chassis attitudes and loading. It's mostly about the tire contact patch and the road surface. And that's only part of the fun.
The engine in (not actually installed yet) 5715 is an all aluminum 401 Clevor with EFI and lots of other goodies. The cam was selected for max power at 6300. You can rev it to 6950 