What cam to use in a 318

The Comp Cams XE 268 below.
.480 exhaust lift divided by 1.5 then multiple by 1.6 equals .512.
I think it will clear. My purple 292/.509 cleared OEM J heads, you need to check your stuff out.

DODGE COMP Cams 20-223-3 COMP Cams Xtreme Energy Camshafts | Summit Racing