Hey everyone, I have an 86 IROC that’s had an engine swap. It’s got a 350 and I am able to decode the casting number 3970010, and can also decode the stamp on the passenger side front pad K0815CMJ as K-St. Catherine, Ontario then Aug 15th. What I can’t decode is my partial vin. there are NO LETTERS in it. It reads “161102109” can anyone help me with this number? Everything I see says a letter should be in the third spot but it’s DEFINITELY a number 1 stamped there and even if it was supposed to be an “I” there is no “I” plant code that I found. Someone please help me figure out what this engine is from. I have it narrowed down to a 1974 Police car.