Please help me identify my I6!

[63ChevC10]

Ok, my apologies in advance because this has probably been covered here a million times over. I just can't seem to figure out anything other than it's a 230-250 out of a 64-76 Chevy/Olds. The engine is currently in my 63 C10 long bed.

Here's the casing number:

3921968

Here's the numbers on the pad near the distributor:

F0527CCG
2 L527678

Here's the numbers back by the starter:

CON2
E260

I'm hoping I put O's where they are supposed to be and zero's where they are supposed to be. Any help is much appreciated!