The crossmember will need to be modified or replaced. https://waltonfab.com/product/1953-54-chevy-passenger-car-trans-mission-cross-member/ Earlier cars take a similar, but different one.
An expensive one. there are a few to choose from. Randomly picked when they pop up in a search. https://transmissioncenter.net/shop...mission-200-4r-700r4-4l60e-th400-th350-ch301/ https://transmissionadapters.com/pr...jfi5wN7i3DReV2-dycrnL7NLtJCp8ktoRH4XLSSfbb9MU I wouldn't bet on this one being up to date. Tom Landgon sold the rights to his Turbo 350 to 235 adapter to Papa Gee / BGG motor sports https://www.instagram.com/barry54chv/ Barry has his shop in Kingman AZ now. I've got a feeling that this add is out of date but the photos show the pieces in it. https://waltonfab.com/product/langston-stovebolt-adapter-plate-1941-1962-216235-261/
Word last year https://www.inliners.org/ubbthreads/ubbthreads.php?ubb=showflat&Number=101186 Was that he has pretty well retired and is only doing some specialty work.