I did a small area where it will be very hard to see after the motor is installed with 1500 grit sand paper and then buff it with Meguirs number 7 by hand not by a buffer just to test the waters. It does make it shine and feels much smoother. It is a step in a positive direction I can tell you that for sure.
A friend of mine did his 71 cuda ...the whole car! I believe he started with 1000 then 1500, then 2000 and got it buffed. It is very shiny and the paint looks deep.
