what would be your diagnosis?????

I agree that it's low, but you probably know that vacuum gauges can be all over the place. I never trust their numbers as absolutes, but they are a fine diagnostic tool none-the-less.
My Hughes HE 3037 is advertised at 276* intake duration and pulls over 10/11 at 700 with just 14* of idle-timing. That's on my gauge.heehee