Good board , u will enjoy it

Standard fin will be fine , but for your weight id go bigger.
Bigger the better i say , if your going the same type of fin id go a 48 or so. If your really powered up and the fin gets a bit too much then the original will be perfect.
Because im also heavy i always go to the bigger size ( helps getting on the plane ) even overpowered ive never had a board tail-walk with my weight . When i use my 8.2 im tossing between a free ride 52 or slalom 48.
ps : it will never go upwind as high as your long boards.