Report says it will use power train from the 2020 GT500, but also offer manual option. Offered under the Low Car Volume Manufacturer's Act. (The act has yet to be finalized but was shaken loose from Congress after SEMA threatened to sue.)
https://www.motor1.com/news/301760/f...-1-production/
This would imply that Ford will submit the GT500 engine as for compliance with the act. As of right now Ford does not have a compliant engine with the only offering currently coming from GM. Submission requirements include the engine/ECU be in current production so that emissions are carried over from that platform.
Here's Superformance's statement
https://www.superformance.com/factory-models/gr1