Type F fluid in 727

So I picked up a 68 Polara not long ago with a 383 and a shot 727. I finally got around to swapping out the transmission with a 727 from a 77 New Yorker that I had sitting around. I cleaned it up changed the filter and adjusted the bands before installing it. It shifted smooth and through all the gears before I removed it from the New Yorker. Now it seems to clunk into gear when going from reverse to drive or vice versa. Could I have misadjusted something? It seems to go through the drive gears just fine. One thing that I do need to mention is that I flushed the system and used Type F atf instead of dextron. I had read somewhere on here that it was better fluid and the 727 ran well with it. Is this the cause of my problems?

Another issue I’m having is that when I try to put the column shifter into position 1 or 2, the part that swivels around the column is hitting the bottom of the brake booster. Is there a way to adjust this? I have the linkages lined up correctly. It was like this before I ever changed out the trans. Is it possible I have the wrong booster for my vehicle and its to big? Thoughts… suggestions…