please help...340 casting numbers

moparwingnut said
...the car is a 1972, built in september '71...the motor however says 25/72...so, assume it is not matching?

So you dont have a month or it is a 1 for jan?
Anything's possible, could have got a motor 3 months later. Lol

It looks like the Weeping head gasket is thicker than a stock one so who knows