not sure which brace Rocky was thinking about, there is a different upper rear brace for the '71-'72 HO motor to clear the pre-heater assembly. Here's Pat Brown's website with details of the HO brace a few pics from the top:
http://www.455-ho.com/documenting-an...a-455-ho-blog/
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'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
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