I have some Edelbrock heads, that have been milled to 51cc for more compression. They will be going on a stock shortblock, so stock pistons also. Question is, since they are milled that much, how big of a cam can I use? I wanted to run the Crower 15512 cam, with 1.6's but I think that might be too much lift and I'll run into PVC problems. The total lift for the cam is .496"/.512". Too big? If not, what other cams would you suggest?