Arrow spine depends on alot of different factors, like arrow length, point weight, cam type and many more. Your question is very generic and would be answered better if you gave more information. But for most 60# setups a .400 spine arrow will work.
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2008 Redhead Toxik - 68lbs, 26"
QAD Ultra-Rest
S-coil Stabilizer
Axcel Armortech HD sight
Scott Wildcat release
I use 400 spine at 58 pounds for target arrows, cut to 28 inches. But for hunting I have to go to a 340 spine, because I use a 220 grain broadhead. You'll be fine with 400's. Unless your shooting a heavy FOC or your real short or real long on your draw length.