We have installed probably at least 20 kits in the last year and a half, and the tallest driver we have is 6'9". A 2 inch drop should work fine for your 6'6" friend and you are kind of on the borderline whether you would need one --- if so a 1 inch would be fine. Northwind is the place to go, and we usually have some kits in stock if we can assist. Work hard, he will love having a Snake!
Respectfully,
Bill Pemberton
Woodhouse C,D, J
1-800-889-1893