Down to the small things on the car i got. I have 73 Challenger has 340. No a/c on this car. I was going to install power steering pump, with the parts that came with the car. Well it doesnt line up with the 2 groove pulley on the balancer. So i had a 3 groove , but then i had to change the water pump pulley becouse the first one wouldnt go back on with the 3 pulley. So with the power steering pump on it lines up with 1st groove but so does the water pump pulley. The water pump pulley from before lined up with the alt, but the new one will not line up with alt now . I think the water pump pulleys are different , or are the power steering brackets different ?