Everyone is giving great recommendations here. That being said let me give my take on this. None of the parts are realy wrong but maybe just not right for combo. Maybe some not my choice but should have still made way more power than it did. when the veh was brought in it was brought in mostly because he was having a spark knock issue so the first things checked was plugs and timing. found there was the wrong plugs in it. It had short reach j style plug when it needs long reach n style so plugs where changed timing was locked out at 34. Doing low speed runs found the carb was very lean so a jet change was made. Full pulls where found to be lean but not in the danger zone. Still my thoughts thou where the tuning was not going to make up for that much lose in power. Tried to add some jet and it went crazy and didnt like that at all. My thoughts are I would have done adjustable rockers and different springs. I have never had much faith in those springs that come with those heads. Also it seam like lifter preload may have been to tight without knowing what the adjustment really was when assembled with the none adjustable rockers. Also if cam was not degreed in just the power band would just been off not that much of a loss unless it was way off,but he said it was dot to dot. watching the graff the converter was going to about 3700 rpm so that wasn't way out. now that the motor is out I would get the heads set up get the rockers. Not a big fan on spending the money on new cam that cam is fine. On another note car was done very nice and the customer and his son and friend that where there where great to talk to