You'll need a BB bell housing that will fit your car. I don't think the 69/ earlier B body bells will work in an A. My '70 RR had a "fake" 11" clutch, (10 7/8) so it basically is a 10 1/2" cover and bell housing, that would be the idea what you need.
The retainer on your four speed may or may not fit the hole in the BB bell
I don't know what pan/ exhaust you need. Radiator lower outlet is on wrong side, you'll either need to have the outlet switched by a rad shop or replace the radiator.
If you have power boosted brakes, you'll have to do something with that.
