Setting Dwell

Ok I finally checked the dwell. Wanted to know exactly how to read it on this meter. The first photo shows about 750 RPM idling in park after I warmed it up. The Dwell reads at about 26 degrees on the second photo.

The book calls for 30 to 34 degrees on a 318. Should I re-adjust the point gap? If so would I widen the gap since it is lower than specs? I didn't disconnect the vacuum advance from the distributor. Will this make a difference?

I set the timing at TDC about a month ago if this matters.



Thanks.