Stock intake vs performer?

Any difference between a 71 and 72 stock intake? My intake is number3614025. Also where do you find the casting number on the crank? Better see if I have any more surprises. My blue late 71 block has orange J heads with 1.88's, I swear I will puke if I discover a cast crank! The parting lines look good and the balancer is a forged crank piece.