904 causing knocking noise?

Okay guys... I think I want to "V8" my Duster. I have an 89 Ramcharger with a 360 tbi. Can I remove all the smog crap, replace Tbi with carb and put in my Duster? The engine moves the Ramcharger like a scalded dog, and since the Duster is at least a half ton lighter, it should really move. Too big a hassle? Or worth it?
Thanks!