i think your starting to get it a little.if you do not own a 73 duster you may want to edit your thread starter("i want to put a/six in my 73 duster")and if i may suggest removing "the 340 hammer",unless of course ,you drive a 340 car.but do what you want.this is jmo.just trying to spare you any more humiliation.good luck on your car hunt.if /when you get you car ill be glad to answer any questions i can.