Is the stock type transmission mount strong?

Ditch that and get the later style trans cross-member that features a captured thru bolt.
Like off of a later Duster? Is this a spool type? I can see where the captured bolt would be a stronger design. Is it just a bolt in swap? Here's the Valiant it's going in. 543 hp with a 150 shot. I may be overthinking this, but the more I look at, leaving off a transbrake at about 4000 rpm, that syle of mounting looks like a weak link to me. I appreciate the help and input from all!

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