i have the opportunity to buy some ported pi heads with custom grind cams. the specs on the cam are 225 intake 230 exhaust at .050 with .550 lift and 113 lobe sep. so its basically ported pi heads assembled with comp 262 cams all for $800. he said he was makin 310 hp to the wheels with exhaust and plenum combo. i thought thid was a real good deal. what do you guys think? how realistic do you think 310hp is?