Clutch kit recommendation needed

toolmanmike said
Brewer Performance has performance clutch kits for that 9 1/2" flywheel. (you didn't say you will change to a 10 1/2" set up)

Hi Mike, IDK what size flywheel. I'll find out when I do the engine swap from the 273 to the 340. what is the advantage of the 10.5 vs the 9.5? more area for the clutch to grab?