Auto to Manual with Sr20det in one shot

[MugenNeuspeed]

Alright, I am new to this forum, I hope I am not asking a too naive question, but I am on dial up, the search wasn't working too well for me and here I go.
I own a 93 nissan 240sx 5 spd currently, but I want to keep this stock because its running so good and I don't want to mess with it. i have the chance to get this 91 automatic with HUD coupe for 800.
My question is its an auto and I saw than an auto to manual swap is cake on the 240
My question is that can I do the sr20det changeover into the automatic with no problems and do the mounts line up? from manual to auto?
I am obviously going to get the front clip and if I do, will I need anything else other than regular maintenance like water pump and other gasket?
I hope that i am clear and thanks for your help, this is supposing that the front clip comes with all the clutch pedals and all the necessary parts necessary to convert a auto to manual