I feel that way too, but I am one of those that likes things to look stock. Afterall, its a pre-HEI engine. I can hide anything just about anywhere, but that big honkin distributor cap is pretty hard to hide without drugs. That's why I felt Jason had a pretty nice solution, but its not available, and it requires destroying the lobes on the original distributor. The only, ONLY person to talk to then is Tom Langdon, who offers a mini-HEI that people like me (and I assume others who feel that having a distributor cap larger than your truck) could marginally live with. But then, and most people don't know this, you wont be getting to the bottom of the distributor (weights, springs, etc) because the modifications exclude this. And, it doesn't use your stock distributor. They are getting harder to come by these days too. In good shape, with good lobes, good gear, and no wear on the shaft, good luck.
So many sacrifices. I pride myself on finding solutions, but this one doesn't feel real easy to resolve. Its why I try to ask people who do know. Thanks Bill. Thank you all for what its worth.