Bell housing casting number?

can anyone tell me what year and engine this bell housing might of been on? Casting#3743859 Thanks Warren

I would assume that this is for a small block motor? Double check the casting number to see if it reads 3743959,as this is a 318-360 bell housing.This is for a 10 1/2 or 11 inch flywheel.Check and see if it is a cast unit or aluminum unit.And if its a big or small block unit either.This dating is up too 1977.Mrmopartech