Since all small-blocks use the same x-member it is logical that a 454/TH350 could use the same x-member as a bb/4-speed. But they can be a bit pricey and as this is a hot rod you need not bother.
One solution I've heard of is to use a later model 1-bolt trans mount with the standard non-bb x-member which you already have. As the correct bb frame brackets also position the engine about 3/8" forward of the sb location you may have to elongate the hole that lines up best with the trans mount.
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