Best donor for MPI

My question is what would be the best donor vehicle/year for Multi Port Fuel Injection? I would like the benefits of OBD2 but Ive heard there may be some reasons to avoid the first years of OBD2? I already have a 93 ram van with 5.2 OBD1 and a late 95 ram van with 5.2 that is OBD2. I have a magnum 5.9 that I want to run in my 70 valiant. I could take the harness and fuel injection parts from my 95 van and find a 5.9 ecm but I am a little wary of mix and matching parts from different vehicles. It seems that security system may be an issue on later magnum donor vehicles so lets hear what you have had success with and what offers the most support as in programers and aftermarket upgrades.