[a1ohn]

Hi:
I’m trying to trace what the engine, in my shamrock cobra origanaly came out of.
The engine casting number is : GM 3970010 and the number from the front of the engine is : 685225 R K06 07 H
I’ve been told it was a chevy deville sedan 1972/75 350 ci
small block V8.
Could this be true, and are there any more number’s I would need to identify Further.
Or do Shamrock put on there own engine number’s ?
Any help would be much appreciated..

Thank's a1ohn