I'm starting to research a new project to install a 6.1 L Hemi into a 1969 Barracuda Convertible (original 318, 904 with console) and using RMS front and rear suspension. The Keisler 4L60E Hydra-matic kit looks like it will install without any body cutting or mods, but I cant find out for sure if the Mopar 545RFE 5 speed automatic will install without any body mods.
No, it absolutely does not fit without a lot of floor modifications. See FABO Forum on 3rd Gen Hemi Swaps. I just posted a lengthy expalnation of what I am going thru to weld up the floor. We have a 6.1 Hemi, 545RFE going into a 69 Dart.