From those cam specs I am thinking you are too high on the compression for that cam. However that is speculative.
Find out the intake closing point of the cam, plug it into this calculator along with the other engine specs etc and see what you come up with. Dynamic compression ratio is important to determine cam selection.
http://kb-silvolite.com/calc.php?action=comp
List the aspects of the vehicle weight, trans type, rear gear, tire size all these have a say as well