just pulled a 8.75 from a 66 b

For the blue 65 dart.
Also I am going to use the 273 I got with my 66 cuda in the dart.
I got the complete manual disk brake kit from Master Power with cross drilled and sloted roters (sp?)
I am doing a sub frame swap with bigger t-bars instead of convertion mounts.
Thinking of leaving the bench seat and I am paying a lot to get a trans that will bolt up to a LA and be cable shifted by my col. So it will all look stock.
I think I spent like 3 grand on it this week.... and all I have is a pile of parts and stuff that is not yet shipped.
Rear brakes I am thinking late 80s M body cop.

When I have all this out should I relocate my springs inboard? Is the kit still avail?