Here's one on the other end of the time line.... 69 L-78 LOS motor cast date G 18 stamp pad T0820 JH, casting on block 3935440, car build date trim tag 09D 68 . Heads: H 18 and G 318, water pump G 18 8 , Dist. dates 8G18, Harmonic balancer date H8F, Intake man. 3- 29-68. Intake seems early to me ?