Mo power for my Mopar 340...

I don't know what rear gears are in the car yet... But I do know that the 67 Dart should be about 3,400 lbs... The OD tranny has a low 1st gear at 3.09:1, then goes to a 1.67:1 in 2nd, which is a big change (46%), then 3rd at 1.00:1 is a 40% change, and 4th at .73:1 is a 27% change... That is not what I would call a close ratio tranny, but it's what I've got... the standard 4 speed (pre 75) has a 25%, 33%, and 25% difference between gears... I would say more for performance than economy... Thanks for the input....