What cam should I get?

Yes the flow does not improve over a .450 lift but if you go say .480 it will flow max. a longer amount of time. You just want a good sounding idle I think you be happy with comps HE 268 or even a HE 260 but I would get the HE 268, oh it has .454 lift so it should flow great. I do not like 1.6 rockers for a street motor, puts too much stress on everthing, you want a bigger cam than get a bigger cam, those lobes are for a 1.5 lift.