Trying to decode my block

[Alpine85]

I bought a 81 notch with a 302 in it and I'm trying to figure out what I have. If someone could give me some help or at least point me to a website that has the information needed to de code this I would thrilled. The number on the block behind the intake is m 193906. If this isn't the number that is needed let me know and I'll get the right one.

[83GTJIM]

If I remember correctly that should be a match to the last part of your VIN IF it is the original block to your car.

[Alpine85]

If I remember correctly that should be a match to the last part of your VIN IF it is the original block to your car.

Didnt all 81s get the 255? If I did it correctly the m means that it's a 5.0 but the other numbers are just yearly production numbers. How do I find out what year the block is? Trying to find out if it's got the forged pistons without pulling the heads.

[FoxChassis]

1FACP40E6MF193906

1991 LX 5.0L coupe

Casting number prefix on block near starter area should be F1SE