I'm 14 and trying to get my ag permit. I practice driving every once in a while in a 1975 Ford F-750 dump truck that we use on our farm during harvest. I also have a 1947 Chevy Loadmaster sitting in the yard. It doesn't run but I'm trying to get it fixed. The first step is getting the oil and gas drained. That's a chore. That drain cap won't come off for the life of me. It's a 7/8 in. bolt head that is stuck. I've tried rust bomb, oil, a ratchet, a wrench, I've hammered on it, got sidetracked by bees, hammered it again............ The list goes on and on. Can you give me advice on how to get it off and how to rebuild the engine? I need it ASAP.