Thanks guys. Not much to update the past week or so on this. Starting on wiring- this is a 97 car and due to the relocation of several things I am pretty much rebuilding an entire harness to work with all of this. That is not something necessary for the conversion, just something I am doing to best fit the engine layout.

Transmission shift linkage bracket and lever were made to work with the factory cable and stay clear of the turbo so that is covered.

Axles have been sorted out and is a simple drop-in solution. There were really only 2 main axles used in the vehicles that had the 4T80E transmissions and these vehicles all used the same axle both left and right side. A main stream Caddy/Aurora/Bonneville GXP axle length was a great fit on the drivers side. The Eldorado and a few other models used a shorter axle which turned out to fit great on the passenger side. The outer end of these axles is the same as the Wbody so nothing needed to be done with them, simple solution.

The throttle body and battery arrangement has been finalized and I can retain keeping the battery in the front, just turned 90 degrees from stock location to give a little more room for the inlet tube to the throttle- which will now be located in front of the fuse and relay box due to this being an Fbody intake. This is a 99+ style Fbody upper intake which used a drive by wire throttle body, though I am using an L67 throttle body which works with stock throttle cables and also will work as the stock cable is very long and wrapped around the strut tower so gives plenty of length to move to the other side. I found that moving the fuse and relay box backwards about an inch opened up a bit or room and clearance for the throttle body to fit here, lots of chewing on ideas and relocation but turned out to be a very easy fix.

After wiring is finished up I need to build a rear manifold/header and fab up the new crossover pipe to feed the turbo. Since I have the throttle body on the passenger side it opens up a lot of options for a front mount intercooler. A Tru-Cool maxi cooler transmission cooler will be fitted just above the intercooler which is what I have been using for the LS4 V8 turbo cars and works very well.