removing lower unit

[seth1904]

hi everyone i am trying to get my lower unit off my 50 hp lark (model no 50373r) to replace the waterpump and i cant get it to pop off, i have removed all the bolts and the one for the shift arm and it still wont move is there any clips or anything i may be missing any help i would appreciate because none of the dealers around here want to work on it anymore since its a 73

[boats.net]

If have all 6 bolts out and shift rod disconnected then it should come off, if not drive shaft splines are probably corroded into driveshaft.