One of 340 engine I guess the car is long gone

I have had it since 1978 or 79.
Numbers look like 3B125205 ( 4)
Dated what looks like 2.11.72 Steel crank. 2780930-340-5 Had J Heads.
Car was wrecked so I pulled the long block guy said he still may have car the fixed.
Anyone know if the car still around?