If I remember right, the biggest issue with the original 4 piston calipers is that they aren't a floating design so when rotors and pads go out of spec bad things happen easily.
FWIW, I'm now running a Wilwood two piston caliper and like them quite a bit.
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Ken
'68 GTO - Ram Air II 464 - 236/242 roller - 9.5” TSP converter - 3.55 posi ( build thread | walk around)
'95 Comp T/A #6 M6 - bone stock ( pics)
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