H1 Cap subject 6 year clock reset

I need some help.

Worked in USA on L1B visa from Jan 2009 to May 2013.  (aprox 4 years in USA excluding vacations).

Changed to H4 immediately from May 2013.I am Currently in USA as of November 2013 on H4.

If I apply H1 cap subject in April 2014 to be valid from Oct 2014. what kind of validity i would get on my first H1. If I exit USA in Dec 2013 and choose to enter after 365 days. Will I be able to apply extensions to avail 6 years of H1 validity down the line ?