LOL… I wish we had at least one member with a carbureted BBC, Vintage Air, and this VA/Spal Monster mounted and functioning properly.
If the VA instructions were followed to the letter, the sensor would go in the intake manifold port, the one we normally use for our engine temp gauges. It’s kinda counter to everything we normally do, but yeah… if you want 195 degrees to trigger the monster to ON, you’ll probably see hotter coolant coming from the head. I guess you could not connect the bypass hose and put one of your sensors in that port?