I am correct in check dwell with the meter with engine running, I put the + lead on the + side of coil and - lead on a engine ground to get correct reading?

or is it both side of coil?

with cap off and points snug and using a small flat blade in the points base notch moving it to open the gap or close gap as needed to get the dwell reading as it is cranked over.

if this is correct, then I have found the cheap points do not have a long enough slot to get 30* dwell and I only get 25* dwell.

maybe a NOS set of mopar points is what I need to get it set.

TIA