Ok i recently got a 350, enginge put in my truck and now i want a better tranny. Right now i got an automatic, gowerglide

. I want to go to a manual and i hear alot of guys got a 350 tranny. Is this a manual right? is it a good one or what? and how many gears is it? If u guys wouldnt go with the 350 what tranny would u go with and y? thanks fellas