Auto trans to manual trans

[streetstrip1972]

I just drove my buddy's 71 SS nova with a M22 in her and now I'm ruined. The TH400 that i have in my truck is just not the same.

So my question is how hard or easy is it going to be to put a 5 or 6 speed mt in?
And what kind of transmission would be a good choice. The ones online that i have found are only good for 400 to 450 ft/lb torque, I have a 468 11:1 flat tapped cam that puts out a round 550 hp

Any suggestions or thoughts would be greatly appreciated

Thanks Bobby