i found a Cam

well my dad told me that he had a new cam for his 318 when i was a kid that he never put in an i found it still in the box in the shed its the 508 MP an the lifters.i want to put it in my current 318 but the bottom end is all stock will the cam have any effects on that also the heads are stock with a home pocket port job with 500" tested springs will this also be a factor?if so what sould i change to run this cam with the heads that i have on her now?