Doubtful you’ll find anything off the shelf to facilitate that swap.
You have 2 reasonable options.
One being pay a hot rod shop to make the mounts for the Chevy engine and trans.
Second one would be to simply rebuild the 347 and not have to mess with everything involved in changing the complete drivetrain to something foreign to the car. Also the ‘58 370 and ‘59 389 are both bolt-in swap candidates that will mount the same way as your 347.
Neither option is cheap. One thing to consider is both the value and your ability to sell the car sometime in the future will be greater if your keep it as originally built.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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