Ball and trunnion to u-joint conversion?

Put a 66 trans and driveshaft in a 65 and earlier without trouble. Not sure why you are switching the K but /6 and V8 take the same K member.
Had an issue on the interstate with someone’s trailer hitch that fell off and a semi. Needless to say my k frame is toast along with the lower control arm and torsion bar on right side. Made it home 58 miles but wasn’t very pleasant. I have an A230 trans to put in which has the shifter in the floor I’m aiming to put in as well. I know it fits that trans. But while it’s out I’ll check my factory trans