Staying stock stroke? If so, a pair of 28mm PWK's would be better, but a set of 33's would be just fine. They would certainly pull better from mid to top. The 33's would also be quite adequate if he ever went to a 4mil crank. Either way, the stock crank should be welded and if he goes to a 4mil, don't let Kevin talk you guys in to one of their budget 4mil cranks.