For those following, more solutions have been found and things are moving forward.

The spring plates will be the Mustang 68-70 still, but with holes elongated to allow install on 2" springs and perches. I will cut the ends off the original plates with the 2" hole separation to use like dog bone style washers to keep the Ubolts where they belong and prevent splaying.

The bushing issue has also been solved. I have leaf springs coming from ESPO Springs and Things that I heard about from a YouTube video of a guy changing leafs on his 63 convertible.

Everything but the rear end is ordered, still doing final measurements.

The engine is stripped down and I discovered it has already been bored .030 over which isn’t great. Sourcing the correct pistons for the Tempo is my only option now. Doing a lot of research into cam failure and initial startup for the Sniper unit. I am thinking of setting it up on my running 170 before installing on a fresh motor.