64 Valiant 360 Swap HELP.

Looks like I may get a 64 Valiant as my first mopar project. Been looking for along time. WAY out of my knowledge, but I wanna learn. (Only ever built turbo Mitsubishi/Eagles). But grew up around Mopars. So far, I think I would wanna go magnum 360, 904 trans. BUT I have alot of questions. I have searched, just like talking to people about it as well.

First, being a PUSH BUTTON trans, will this be difficult to convert to a floor shifted 904?
Secondly, I would wanna go disc brakes, would it be better to buy a kit, or I believe you can use other later A body stuff.
THIRD, can you just give me some tips on things to do/use?