SS springs & sliders...

Thanks for the input. Will the existing rubber bushings suffice?

In the rear eye? The AFCO's came with a solid bushing.

My 65 uses sliders and SS springs. I welded 1/4" plate to my frame rail drilled and tapped holes and bolted the sliders. My springs are moved into the frame rail also. It seems to work good I think, it runs 11.70s with a 60foot around 1.53

Now that sounds like a great way to mount them to the frame rail! Plenty strong and you can still remove them if they need service.