Good Afternoon Bud,
The 1533 would probablly be OK with the 6 ft in most conditions, but if your in high grass and pulling some big hills your not going to take a full cut ! I have an old Massey 1040 32 hp engine and 28 at the pto, about 2 hp more than the 1533, and I use a 5 ft bushog squealer and I have to take smaller cuts in deep grass when pulling steep hills ! If on the flat, you should be fine IMO !