Stan;
Are those the big 5 gallon White Mountain freezers. They look to be about that size in your picture, not sure if anyone other than White Mountain ever made them. I have eaten ice cream form a couple of setups very similar to this & they also used the JD hit'n'miss for power.
One year back in the early 90s we went to one of the JD two-cylinder expos out in Waterloo Iowa & they had a couple of the 5-gallon freezers making ice cream. They had theirs set up though to run off a PTO & had it hooked up to a 420.