I have a 1969 Firebird that currently has manual steering. I want to convert to power steering but all the gear boxes I've found have 4 mount holes whereas my manual has only 3 mounting holes on the frame. I can't believe they made 2 seperate subframes depending on the steering. I guess I underestimated what would be involved in this conversion. I'm stuck and would really like some help. Also is the Pitman arm different on the power steering?