I would be concerned as well. However, I know of those that do it.
The head to intake manifold sealing surfaces require a smooth finish for a leak free result.
I am sure you are aware of the boss holes on each corner of the heads made for lifting? The Windsor heads use an M14, the Romeo uses M12. The bosses are in the front left and back right.
It can be difficult attaching the leveler using the head bosses. The valve covers need to be protected. If the bolt sticks out too far on the back right, it will interfer with the AC hard line.
Of course if you are willing to take the intake manifold off, then the valley front/back webbing makes a perfect attachment point. Down side is that the intake manifold would need to be installed while the engine is in the car.