Well, I knew if I'd get a rise out of somebody on this. I guess I just don't see it the same way. Maybe it's my racer friends influencing me again. I'm running a 250 HEI in my 261 without the vac hooked up and it seems to be fine. Do what you want. As for adding vac to that dist., Just take the vac assembly off the original, and clamp onto the Mallory. You may need to open up the hole in the clamp or turn down the dist housing, but that would be the worst of it. Just make sure the distance from the clamp to the end of the shaft is correct when you're done.
