I am working on a 48' ford convertable with a 70's 301ci gm small block, turbo 350 trans, ford 9" rear and buick steering column. I have a ps sector box off a 65 gallaxy 500 which i have bolted in there (space is tight around the headers), and a ps pump for the 70's gm small block. From what i can find my pressure and flow rates are compatable enough but when i crank it and start to turn the wheel the wheel begins to jerk back and forth until i shut it off. The system was bled according to instruction for the steering gear and it is a new rebuilt gear and pump. the lines are not backwards. ANY IDEAS would be WONDERFUL!!!!!