I guess it depends on your choice of rockers. The Crower Enduro stainless roller rockers with polylocks fit under my 1964 GTO chrome covers using thicker gaskets. I have factory A/C to contend with as well.
Pictures and text here: https://forums.maxperformanceinc.com...0&postcount=34
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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