I know this is a 350 4 bolt and it is not out of my car. Can anyone tell me more?

The numbers on the boss below the head are:

T6F733191 VO512TXB

thanks for the help!

Truck block???

Truck block???

Ok.

Is that bad?

Unlike the "tall block" big blocks, all the small blocks were the same, correct?

V0512TXB breaks down as follows:

V= Flint assembly plant
05= May
12= 12th day
TXB = 1975 350cu 4bbl carb 165hp RPO LS9 out of a C20 to 3500 pickup

T6F733191 in the confidential VIN code and it always tells the exact year.

T - GMC Truck Division
6 - Model year in 1976
F - Flint final assembly
33191 - Last seq digits of the VIN but is one digit short, was 6


So it out of a 1976 GMC truck, not a 1975. The engine suffix crossed model years