Converting project 2.63 version to version 3.19

I have a project that is version 2.63 and need to upgrade it to 3.19.

Shouldn't be a problem, but when opening it in 3.19 all math functions become Real-type which i don't want, some should be integer. Is there a way to handle this without needing to change everyone manually? Its about 150 functions which would take forever and most certainly go wrong here and there. Also all of my generic parameters in and out becomes J1939 parameters instead. I want them to be generic parameters.

Is there a function where you can select a channel and then replace it with another? For example I select a math (real) channel and choose replace with math (integer) channel, keeping all the functions inside.

Otherwise Is there like a texteditor where you can open the project file and search and replace function codes?