Gear Vendors question

I've installed more then a few.
Minor mods lol. Mopar Tim as Hoppy suggested did his in his 65 dart major tunnel mods.
First one I did was my 68 gto 4spd. 20 years ago.
It's not difficult if you have a lift. Just a lot more then a few bumps on the floor pan.
Good product and fun to drive.
Would you mind describing the floor mods? Some claim whacks with a big hammer, some claim major surgery. In my case, considering for a 69 Swinger 4 speed. Thanks.