I'm following your post to help me make the best decision for my 64 Belvedere. I agree that 16:1 takes too much arm strength & just talked to Dick at Firm Feel about a 20:1 manual box with the stock pitman arm for my 64 Belvedere & he said it would be a good set up. Still am deciding between a stage 3 power box upgrade or to have them do a 20:1 setup in a manual box I have. Forgot to ask him about the 20:1 box with the fast ration pitman, so will call him tomorrow.