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I would replace all those push button and slider switches just to be sure. They aren't expensive.

Yes, but why complicating a fairly simple logic circuit? ;-) Going this direction the whole game could be remade using one microcontroller... Not sure if you found this, but one guy already designed a 74198 replacement using two 74LS194s Will this work here?

From what I see the 74198 register will have to be replaced with some alternative solution for a possible modern recreation due to difficult availability.