1991 power ram 250 318 manual tranny with AC, swapping from a 4 speed to 727 automatic. I have available all the tranny, steeriing column, driveshafts, etc. But The ECM has me puzzled, it appears 1991, is all by iteslf for ECMs and had a different computer for each engine and tranny variation, not a great concern as I can boneyard one or get one reman. But what about the engine harnesses, are all the 318 and 360 ECM/engine harnesses the same and have compatible ECM connectors?

Thanks