Stroker physics - where the differences are?

Stroker physics - where the differences are?

I read a lot of comments on the character of SB strokers on this and other boards from pretty knowledgable people - but I don't always completely understand why SB strokers behave the way they do...

Im hoping someone can deal with the following questions/comments and it might give me (and others) a better understanding of how they are different from the Standard Stroke engine.

1st/ -

The piston moves away from the valve more quickly

Why?, and
What effect does this have on induction ie Do we need bigger carbs? Do we need bigger plenums?, do we need bigger valves? than as for the std stroke engine?

2nd -

Strokers really soak up the duration

Again - Why? Also,

What causes a choppy idle and why does a stroker smooth it out?

3rd - Ignition timing -

You need less total advance for a stroker

.

Why?

I hope these questions don't require too much time to answer - but Im sure it'd be useful info to know.