Yes its relevant, if it's a High mount starter than it will be nearly a direct bolt in. The main difference is that the Fairmont's and the other Fox Chassis cars use a different Oil Pan, plus the Oil Pump Pick Up Tube, also the Oil Dip Stick and its Block Tube. So you will need to use all those parts from the original Econoline engine 144, 170 or 200 Ford small six so which ever one of those you have now it will work on the Fairmount engine to convert it for use into your Econoline. You can use a small freeze Plug or drill and Tap it for a screw in plug to close that Oil Dip Stick Hole that not used the block should be drilled for the dip stick position that you need. All the Ford 200 Small Six short block's from 1966 to 1981 with a High Mount Starter are drilled with both the Small and Larger Bell Housing Bolt Patterns so you can use either size on those blocks and all your current parts will bolt on to it. Best of luck