manuel swap

Who is Manuel?
OK. @Projectile Dart is right. you will need to cut a hole in your floor and weld in the 4 speed hump. I did a 3 speed auto floor shift to 4 speed conversion about 15 years ago. It was not all that hard. I think the hardest part was deciding exactly where to cut and where the hump goes. Hopefully someone with the carpet out of their car can give you some measurements. Once the hole is cut, and the engine and transmission are in, the rest is downhill.