Transmission Tunnel Modification?

[Tod59]

Hey Guys-

I have a 59 short fleetside with a 6cyl and a 3 speed on the column. Plans are to install a 350ci and either an automatic 700r4 or 350 turbo transmission with the gear selector on a new Ididit steering column.

Question:
will my new size transmission require me to modify the floor or current transmission tunnel? My floor is pretty flat now, so I didn't know if there would be room or not for the new tranny.

Thanks
Tod