5.9 Magnum opportunity

If your budget is tight, run it the way it is. If the budget allows, I would actually suggest trying to get the engine cheaper without the single connector OBD1 PCM and harness. Then get an intake, fuel rail, harness, and three connector PCM from an OBD2 truck. That will allow reprogramming with an SCT tuner later on, if you choose to add upgrades.
A 1994 OBD1 setup may still be running an egr too. No big deal, just more things to consider before jumping in.
No matter what you choose, you'll enjoy it when it's done.