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SOME of the parts will work. 273-318 engines have different length compressor struts as the 4-bbl intake is taller making the struts shorter. When I put a crate 360 with a factory 340 intake in my 68 Dart convertible that was originally a 318 A/C car I had to modify the struts. The original parts will work but modifications are needed. As said above 70-up parts are even more different.

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Scott:

Jim is a member that you are going to want to embrace on this endeavor! He probably has all the parts you are looking for as well.
I think you should drive the dart to his shop in Illinois and stop by my house on your way!!!!