Ls swapped rear end question

[gmcountryboy]

Hey fellas, new to the site have a 1967 C10 I've been building for quite some time, stock chassis, carb'd 6.0 ls lq9, stock crank and rods, hyperutetic pistons @ 10.5:1 comp, ARP bottom end, 229/236 cam on a 108 lsa with the ls3 heads, runnin a single plain intake. Engine dynoed at 556 hp at 6500 rpm.. M21 trans, currently has 3:08 but I want somethin a bit peppier. Truck mostly will be driven around town and taken to the track every now and then. Wondering what you guys would recommend for a rear end gear, 3:73 or a 4:10. Truck has 29x18.5 Mickey Thompsons, any input is appreciated!!
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