I have those headers, but havent installed them yet. I was told by holley that they would fit either mount. I have run the stainless works headers on my old DSE subframe, and they fit nicely in the stock location, but hit the toeboard with the setback mounts. I wish I could help more, but Im quite a ways away from installing the hookers. Scott
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69 RS LS3/T56
68 firebird vert LS1/4L60E
67 RS LS2/T56
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