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Is it best to run flattop pistons?

To ans your orig Q, quench will let you run a much higher CR without pinging on your choice of fuel which is important with todays poor pump gas and CR is one of the main parameters that determines an engines power output (squeeze is power). I'm assuming that your(& all) stealths are closed chambers and a zero deck (flattop) piston & a .039" gasket would give you perfect quench but the CR would be too high and you do need valve reliefs so a quench pad gives you the quench distance and the dish takes care of the valve reliefs and in addition the dish lowers the CR to a manageable level and also makes a much more ideal shape for flame propagation as you have the domed combustion chamber and the (somewhat similar) dish which doesn't constrict the flame travel like a flattop piston top does.

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