I have a small block chevy and the code on the front of the motor is "V0510TDA". The code right under that is C8F503926. the code on the back drivers side Has 41GM and right above that is 70010. it also has a dial circle with 10dots with a dot above the top dot and a pointer pointing at the 10th dot. on passenger side back is the numbers 383 and a large S right above the starter. all i have been able to find out is it can be several different blocks. If anyone can help me out here to find out what it came out of and what year it is this will be a great help.