set the fuel flow at 10GPH when above 3000', and open the throttle to full and pull it back just a hair. If that puts you above 24/24 pull throttle and prop back to 24/24. Plan on 130 knots groundspeed.
I just ferried an Arrow 800 miles in sub-freezing temps, including an overnight stop. I used a "twin hornet" engine heater each time. The engine started easier than a summer day each time.
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I spoke with both of these shops and did not have to wait long. In fairness to whoever is taking longer to quote you, the work I was quoted was a full panel gut.
Maybe they respond...
Nope, you will get too hot dressed like that when you are INSIDE a closed space constantly moving around. I did all this in central Texas, but it never got much below 32. Would it be a different story at say, 6? Maybe.