225 to 360 swap

Hey folks, I know this has been addressed numerous times but here we go again. I have a '74 duster with the good ol' slant 6. The duster is great and gets lots of looks when people realize it's a slant car. The only problem is that the performance just isn't there with the little six cylinder. Even though it has an offy intake, holly 4 barrel and hooker headers. I've recently been offered a 360 with the tranny still attached for an unbelievable price. :-D This motor was in a 70' duster that was running 2 years ago and replaced with a year correct 340. The 360 is supposed to be a police interceptor motor (if there is such a thing). My question is: other than motor mounts/ k frame, driveshaft, radiator and a bigger rear end, what else will i have to change to fit the 360 in my duster? Will i have to change the tranny crossmember? Also what kind of price range am i looking at for the parts needed? Thanks in advance.