400 into 73 v8 duster using stock mounts

67Dart273 said

I doubt this is much help, maybe encouragement. Just remember, that "back then," at some point, SOMEBODY put a B/RB into one of those and NObody made swap mounts, or a DIY book and Al Gore had yet to "invent the internet."

Most guys, even shops, did not have MIG welders, either

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I've seen some of the nonsense guys did back then to put big blocks in A-bodies, but the DC K-member came out around 1975 and there were some wrecked big block A-bodies that a few guys took parts from. My older son's Barracuda had been a drag car with a 440 from early in its life (original slant 6 car). The mounts were a series of wood blocks and rubber sheet. That stuff went straight in the trash can.