Running the same Kent TH2 cam as Mark...in my race car.
Engine lives above 5000 rpm except on grid.
No cam bearing; directly on block. In 6 years, no excess wear that I can see (but oil gets changed every 2 to 3 hours).
Seems to be working well....with single carb, it will pull 101 mph with 3.9 final drive (according to onboard GPS).