Vacuum this low normal?

Its a good size cam, and its not going to have a ton of vacuum. Its been my experience to get around 7-8 with this cam in a 340.

Whats your timing at? At idle? They like a lot of advance at the lower rpm, 20* or so. Plus have you tuned the carb at idle with a vacuum gauge to get the best vacuum reading?

Anyhow, timing comes first. Get it in the 18-20* at idle and 34-36* total if you can