Well, you may as well know the rest of the plan so you can get your forces ready for the attack!
361 engine, push-button automatic and one wheel peel differential coming out, along with the front drum brakes and factory power brake booster.
I bought a '75 Road Runner with 440 engine, 4 speed, sure grip rear with 3:73 gears and front disc brakes going back in. The 440 is from '72. The 4 speed is the 18 spline that came from a Hemi car and the rear diff is 52" plate to plate, same as my '61 Chrysler.
I also have a '69 big block complete, including the air cleaner, six pack set up going on the motor.
The only thing I really don't want to modify that I must do, is cut the tunnel from the Road Runner and put it in the '61 for the 4 speed shifter to work. Plan to keep everything that comes out of the car so after I'm gone, as that's the only way I'll get rid of it, somebody can put it back to stock if so desired.