If you want to run a modern autobox there is a thread in the race section with a guy in Aussieland who has the drawings for the early block to late trans swap, it's basically a laser cut 1/4" steel adapter plate with provision for mounting the starter to it.
I used a '59 389 block in my turbo race combo and adapted a TH400 to fit using the midplate. The block is a good foundation for a race engine, my sonic testing showed .250" of metal on virtually all the bore walls. I threw all the rest of the parts in the scrap though!
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