Delayed, non-linear engine response. Gordon would never have it for his flagship Driver's Car.
The T-43 is expected to have a Ford turbo 3cyl. I would guess his reasonings to go turbo on that car have to do with A) wanting to use a mass-produced, already-certified engine for cost savings, and B) weight, size, and packaging as they relate to a desired torque curve. This will be a more affordable sports car so a bespoke Cosworth V12 is probably out of budget.
Besides that, there probably aren't many inexpensive, smaller, balanced high output NA engines to choose from anymore.