what should my dart run?

What heads do you have on it? Any porting done?

FYI, the cam duration is reported in degrees. That is why Mikel questioned your .221 number. It should be stated 221° at .050" lift. The Isky site says this is an oval track cam. Not sure why they designate it as such. But 270° advertised duration with only 221° at .050 seems like a slow ramp to me.

As a comparison, the Mopar 761 cam intake lobe is 268° advertised and 228° at .050. It also has 110° lobe seperation which would tend to decrease overlap and raise the cylinder pressure a bit. That would be helpful on a low numerical compression engine.