You'll need a BB bellhousing, possibly flywheel depending on what you have.

K frames are different. On my 74 I used the conversion mounts from engine-swaps.com for my 440 and they worked great. A previous owner put in the 440 without using the conversion mounts, he just used stock mid 70's BB mounts and while it physically bolted in the SB k-frame places the 440 too high and too far forward, which is why you will need the conversion mounts to correct this.

Manifolds or headers are you choice. The stock SB passenger side inner fender is a tight fit but I have done both headers and manifolds in mine. BB cars had a large cutout on this side for more clearance.

Your rad may or may not be able to do it. Up to you if you want to try or to upgrade. When my 440 was bone stock my 318 rad was able to do it.