Kindof but no and yes.
Kindof because lots of folks thinkthe goal is to 'limit' the advance so in theory it seems right, but its not.
Sometimes it makes sense to limit the advance, but the way chrysler set up the distributors, many more times its better to weld the inside. That keeps the curve shaped properly for street driving, road racing, cricle track when using vacuum advance. Also helps a little bit on the top end with electronic ignition.
yes and no. If just working on limiting the advance (welding the outside) it will be close to the same. If dealing with a long quick initial advance, then the inside needs to be limited.
Presumbably the Mancini unit is set up the same as an original Chrysler Mopar Performance unit. Need to look inside and make some measurements to be sure. If it is, then advance is going to be pretty close out of the box.
It has one. You can adjust when the vacuum advance begins.
With some minor modifications, you can also limit the maxium degrees added. Its explained in the article I wrote.