Si I have this 51 B3B pick-up...I think. It has a 3/4 ton front axle under it and I'm wonder if the engine is too or maybe the entire truck is. The Title says 51 and the rear is a 1/2 ton rear. So anyway.... the head has a casting date of H-4.33.52 There is an A and a P close by then it also has 14058849-7 on it. The block has a casting date of A 5.22.52 on it and along the rail is 1326227-40 and up by the head it is stamed T306(STAR) 402T8I(STAR)what is it?