There was a swap book, "New Hemi Engine Swaps: How to Swap 5.7L & 6.1L Hemi Engines into Almost Anything" by Joe Hinds, but it is out of print. You could look around and see if you can find it. There are several Gen 3 Hemi engine building books available:
https://www.amazon.com/How-Build-He...ef=pd_lpo_1?pd_rd_i=1613254105&psc=1https://www.amazon.com/New-Hemi-Engines-2003-Present-Rebuild/dp/1613254474https://www.amazon.com/Hemi-Engines-2003-Present-How/dp/1613253575Some online Gen 3 Hemi engine articles:
https://www.enginebuildermag.com/2019/08/unlocking-the-mysteries-of-the-5-7l-gen-iii-hemi/https://www.dodgegarage.com/news/ar...engine-quick-reference-guide-part-i.htmlhttps://www.dodgegarage.com/news/ar...-hemi-quick-reference-guide-part-ii.htmlThere was a Gen 3 Hemi swap series on a Dart in Mopar Connection online magazine that may be helpful:
https://moparconnectionmagazine.com/the-ultimate-a-body-hemi-swap-guide-with-project-orange-crush/Holley has a lot of good information and comprehensive swap systems. They just added 1973-1976 A bodies. I suspect the earlier A bodies, like your Dart, will be added soon:
https://www.holley.com/products/engine_swap_parts/hemi_swap_systems/DIY Hemi is also a good site for harness and ECM info:
https://www.diyhemi.com/Another excellent harness and ECM site is hotwire at:
https://www.hotwireauto.com/This is just scratching the surface. Lots of knowledgeable folks have posted swap info on this site as well.
