If you do not want to use an aftermarket controller of any type then I believe you need everything on that pallet to make it run right. The factory computer has to check alot of boxes for things to run at full power.

I think the easiest way to get going with a Gen III in an older vehicle is a salvage engine and wiring with something like this. https://www.diyhemi.com/product-page/2015-2021-car-quickhemi-harness

I haven't done it but I somewhat follow this stuff. I


68 Barracuda Formula S 340