I think the composite and MLS gaskets also had slightly different compressed thicknesses. I wouldnt mix and match the two types, but it sounds like you originally had MLS gaskets on your car, so replacing 1 head with MLS would be fine.
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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