Hey Jim & 400HP,
Two sources that might have a 390 engine.
Ernie at E.T. Automotive in Garland @ 214-503-1705
Mark Kuban in Watauga@ H 817-281-8374 W 817-834-2829
A salvage yard in Sache had a 1968/69 Galaxie that we got a
oil adapter plate off of, otherwise the engine was complete and I think Cory indicated the entire engine could be bought for $200 to $300. Give them a call Ray Miller Salvage on hiway 78 (972) 442-7964 or (972)442-4485.
Hope this helps.
Alan