Roger, please answer these questions when you have time so that I can get an idea of how much you know about the engine.
1. Do you know how the gear on the distributor shaft engages with the gear on the camshaft? (I'll make these yes or no )
2. Did you remove the distributor yourself?
3. Do you know what Top Dead Center means?
All I know right now is that you knew enough to change the gasket. Tell me when you will have time to discuss it. Just tell yourself that the last time your truck ran was not the last time it will ever run. That has always worked for me. Also I need to know the answers to my questions in my first reply. It's all a step by step thing.