I went from manual to power just to ditch the 24:1 slow *** ratio (yea I know the there are 16:1 manual boxes, I had one) and run larger than 195 wide front tires. I used a Firm Feel Stage 3 box, so no more overpowered steering and a faster ratio, my wife can drive the car too. You will need a Power Steering column or shaft and swap it out int your column, the correct two V crank pulley, PS bracket and PS pump. There is an issue with the pressure line off the newer Saginaw boxes not clearing the biscuit type mount K-Frames. Bouchillon makes a hose to this issue as do they carry other PS items. Do you plan to run headers as this is where things can get sideways? My Doug's didn't clear the the power coupler. Most dent the tube, jack up the motor, shim the box or try to spread the header tube, none of which I felt was a good choice. I ended up with going to Flaming River tilt with smaller universal joint and the column has a slider built in. I liked the idea of having a tilt so the extra cost (~$550) was fine with me. My dad runs a Firm Feel Stage 1 on his 66 Coronet 500 with a 4 speed/440 combo and its nice. Way way better than the original box but you can still drive with one hand when parking.