exhaust manifold gasket yes or no

Are people using these on there small blocks? My manifolds fit rather good but don't want to find out later a simple gasket would prevent a leak. Found a Cometic at .030 thick all steel construction. Was contemplating cutting away the bridge between ports as to remove interference with plugs. Anyone do this. Any reason not to do it.

https://www.summitracing.com/parts/cgt-c5901-03