It all depends on what you want out of it. The Cleveland is a performer at high rpm, but lacks torque at lower speeds.
And the open chamber head engines were bad for detonation. The quench area was loose and velocity was poor.
With domed pistons, and the right camshaft, they became a different animal.
To me, a 351C with 2V heads and a 4V intake made to fit those heads were good street engines. The 4V heads had huge intake ports that were horrible at anything under 3500 rpm.
All relative to what the intended use of the engine is.