It looks like Frontenac heads. They made several types of heads for the Model T engines. There have been a few multi engine set ups over the years but I don't know who built that one.
Some of those guys like Tom Woodruff make some interesting scale models of old designs.
Two Model T engines with dual cam, cool! You might ask on Model T Ford Club of America or one of the Facebook pages like; Model T Speedster Chapter | Facebook