Several things are needed to help identify why your parts aren't making a heap of torque and HP Did you check the pushrod preload on the lifters to see if they had .015 to .030 preload? If not do that Also did you degree the cams or line up the dots? If lined up the dots degree it now Install it so it is installed between 105 and 107 on the intake lobe center(max lobe lift at 105 to 107 after top dead center ) You have the parts needed to make real near 500 HP and over 500 Ft lbs torque Do you know how much valve spring ressure you have on the seats and opened? If so post that also What do the spark plugs look like? Can you post a picture of them? If so do that. Little things can kill the performance of a good combination, been there done that to many times Keep after it, you will make it into a real street stomper like your looking for