You ask that question? Really? What girdles are readily available for SBM? The type that tie the studs together. Which is also consistent with the OP's question. Just like always around here, the commentary veers away from the OP's initial into variants of support for inline 6's and ford stuff. Outstanding. I mentioned nothing but SB mopar stuff because that is the OP's question.
Just keep grabbing the stick in that bucket of ****. Girdles are garbage for a SBM.. Carry on.