Got the 69 inspected and ligned up.Lots of power with the 351.Handles good.The problem is it wants to shift out of first quick.Doesnt matter if your taking it easy or getting on it,it still wants to shift almost immediately into second.Doesnt matter though the tires are still smoking when its in second.Is it the vacum modulator?If I remember right they are color coded and they control the shift points.Any suggestions to fix the problem?I can manually shift it and it works fine.