Dear Brian;
When you change the pully everything matches. The wide belt now fits the dampner & generator and the fan is period also. This all looks and cools just fine.
"flex fans" are for extra cooling which the Chevy 6 rarely ever needs. "trimming" a fan can and often does 'throw it' out of ballance creating another problem that's not needed.
This (pully changing) is faster/easyer.
You can have a Machine Shop do it in about the same time it takes just to mail the Postal Money Order to e-bay and sometimes cheaper too.
It's a 'half day' deal & your done. This is long before the USPS gets it (Money Order) to the distribution center.
Happy trails.
