Reached out to Craig at Dynotorque with some questions around the LT4 swap. I think I have a good grip on what's needed to make it happen.
It honestly seems pretty straightforward, with the shortening of the torque tube being the biggest thing I need to farm out, since I don't have the equipment. I'm going to talk to the ECU company that he worked with on the CAN controls for the gauges/ABS/etc. If they can help, that's worth the savings effort to buy a solution. If not, I'll decide the CAN myself and build a controller to talk to the stock gauges/ABS system (or just put an MK60 system in). On his setup, he piggybacked a separate standalone ECU to do CAN interfacing to the OEM stuff, for reference.
I need to get the Mustang finished up and on the road before I tear into this, but I think I'm sold on the conversion. I'll pull the OEM drivetrain out and sell it, and do the GM setup, probably LT4, as I know the fitment can work really well in the chassis.
Plan is to have 100% OEM interior, though I'll probably mod the gauges slightly to replace the LCD screens in the cluster with something more useful. I'll keep the aftermarket muffler I have now as it's plenty high flow, do C7 headers of some flavor, a good twin disc clutch, and a TR6060 or TR6070. OEM shifter location, MGW shifter. Reviewing engine management, but probably Holley as I'm always annoyed dealing with OEM systems.
We'll see. Maybe I'll look back at this in a year and laugh at the whole concept, or maybe I'll have a 625 RWHP V8 Vantage...