You can use the oddfire but you need to rebalance it to even fire balance. The 77.5 and earlier is the odd fire and the 78 up are even fire. You can pick up a new one from a part store for around $100 but make sure it has the 10.5" clutch. Some of them use a 9.5" disc and have a recessed face. Any RWD that had the 3.8 up to 79 had a base with the manual so you can look for a Skyhawk, Sunbird, Starfire, Regal, or any of them on this kind of platform. Just make sure to look up the clutch first so you know about the disc size.