Thanks everybody,
So far I've found the numbers were incorrect as posted in the first posting.

389 4257
GM
66?

On the left of this is shown.

00N2 C112

So I updated the Month and date to C112 this means that I have a engine made in March on the 11 of 1962. I believe the Pistons are flat top.

Thanks everybody for helping me find my way!!



Julian Carter

1970 Triumph GT6
1967 Triumph TR4A
1952 Chevy 3600
1948 MG-TC