It's going to be really hard to pull off. The 4R70W has an integral bell housing. The 59AB block also has an integral bell housing. Well most of one anyway. Would be 100% a custom attempt and I doubt it will work. If you found and ran an 8BA 49-53 engine it is much more likely to be successful. Like 99% chance of success. Adapters exist for the last Flathead block style.