The 744 High Arch Rowcrop is a very rare and scarce tractor here in UK, from memory I believe many were made and sent to South Africa for "The Ground Nut Scheme" and this is one which missed the boat and remained here in England.
Glad you tuned into the website last night, yes it brought back many memories for me of our winter MCA gathering in Yuma in 2005 and a good photo you posted of the tractor sitting at the entrance to Larry's home and Stuart on his first trip across the pond with me.
The mechanical restoration of this tractor has been a chequered one, which I will not discuss on here, but several parts were "lost" along the way, including the radiator, differential and front Bear, not sure if the hitch was on that one or not in Yuma, will have to check my photo's. So my tractor has been used to pattern some of these parts for completion of the project and what an engineering project to make a new diff.
After all this it is great to see it out and running, but one thing will make you smile Joe, Sunday evening whilst loading up my tractor I noticed they had the top cover off the gearbox as the Cub was struggling to move, eventually they got her rolling again, just as you have experienced with yours.