Gary, I believe if you run XO or XXO they will class you as a vintage engine and the turbo and the EFI aren’t legal in that class. It’s a shame but that’s the rules as they are today. I would double check with the powers to see if this is the case. Maybe JD will chime in on this one.

A 53 Stude and a XO motor, WOW! What more can you say!