I would imagine availability of parts and cost.
You can still pick up about anything you need for a 2.3L Ford engine (as used non-exclusively in Pintos).
Just how much would a Vegamatic Cosworth set you back, and would parts be readily available in East Nowhere, North Dakota?
I think it's a neat install, with the sidedraughts and headers, on a light body, I would think it would scream.