You can use roller tip rockers from Comp Cams that use the "rail". I would recommend using poly locks to help keep the rocker adjustment. I tried using lock nuts on mine and they wouldn't hold the adjustment. These rail type roller tip rockers are good to at least 5500 rpm. This my redline right now so I'm sure of this.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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