Make total sense. Only reason to really worry about the factory location is if you wanted to use a factory trans and mount. With the 8HP there is no reason not to put it where it is most happy.
Completely agree with wanting to keep the SRV function. Why pick a single plane or a dual plane if you can have both?
I've plan planning and collecting parts for a G3 swap into my '74 Duster for a couple of years now with the expected start of the swap being this winter. Then my son decided he didn't want his '73 Duster so now it is up on cribbing so I can install subframe connectors and torque boxes before I drop the front suspension and /6 out of it. Then I can cut the floor for the T56 and actually install the 5.7.
I currently have all the Holley swap parts, my V8 k-frame, (2) 5.7 cores, a 6.4 intake and cam, my T56 Magnum, several harnesses to cut down and (2) different PCM's that I could use. Really just need the time. Goal is to have the car on the ground and rolling before snow flies so I can get it to my Dad's shop where I can work on it in a heated shop.
My mother in law just bought a house in Rathdrum. Make sure to reach out if you make it up this way, love to see the car and I would buy you a beverage in appreciate for the opportunity. I love central Oregon too, maybe when I get my car done might end up down that way myself. My goal is to road trip the thing as much as possible.