I have an Old Air system in my 55.1
It has the electronic control's.
It includes a heater control valve.
Like Vintage, you can call Old Air and talk directly to a knowledgeable person.
Since you're so close, you can also just drive down to their place.
Just off I-35 a little south of Mrs Baird's bread.
That's why I picked the Old Air system, they are so easy to work with in person.
regards,
Leon