I'm currently working on my L-320 project again.  I'm looking to see if there are any builders out there who have flown their airplane with the small tail and then retrofitted the Mark II tail.  I currently have the long engine mount with an IO-320 and have to decide pretty soon which horizontal stabilizer I'm going to go with.  I certainly would love to hear from anyone who has some experience with the different horizontal stabs.  Thanks.