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Have you ever done a Port and Polish of your intake and exhaust ports? You probably can do it DIY with a dremel to delete casting imperfections. But my advice would be to go to a proper shop that knows what they're doing. This is especially true with working on the valves. What it does is make the engine breathe a bit smoother, reduce restrictions and if they are really good, cause air to swirl into the compression chamber. What you would get is an increase in engine efficiency. The added advantage is getting more power out of that engine.
Additionally, with an engine as old as yours it's worthwhile to bring engine tolerances back as it was before. Blueprinting of the engine helps to bring back the efficiency. This definitely need a professional to do it. And it may cost you a bit compared to where I come from. Its old skool tweeking of NA engines that really pays off.
Just a thought.
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