On my '69 I'm running a stock subframe with stock-type drum spindles and using stock-type steering components, but I'm using a mixture of aftermarket arms, "long" upper ball joints, shocks, brakes, and 2 inch drop coil springs. I did not need to do the G-mod due to the aftermarket arms giving me the same camber/caster gains that the G-mod would do. My setup will allow me to run 275 tires up front on an 18x9/9.5 rim and still have good steering clearance and turning radius without notching the frame. I have a fairly detailed write-up with photos on what I chose and why on my build thread here:
https://lateral-g.net/forums/showthread.php4?t=37743
I'm not recommending my setup to anyone, I'm only giving you an example that seems to meet your requirements. It's not a 'system' from one single manufacturer so I lose some support potential there and possible other 'system' features, and I may run into bump steer issues which I noted in the write-up. That's something I'll determine once I get it on the road/track. If I have bump steer issues, I'll have to figure out a way to raise the mount points on the center link or raise the centerlink itself, or lower the mount points on the steering knuckles. Lowering the mount points on the steering knuckles may be challenged by rim clearance. I'll deal with that if bump steer seems to be an issue.
Good luck with choosing your setup.
