Pissed off with motor, want to change

Sound's like the same problem I had with a Chebby 396 I built year's ago with a Comp cam and Rhodes lifters.engine ran awesome first 600 miles than started a slight miss that got worse.When I pulled it down the cam lost 1 exhaust lobe,only cam I ever lost,I blamed the Rhodes lifters,but.i installed a new Crane flat tappet cam and lifters,broke in properly.worked great for 30,000 miles,till I sold car.Also clean debris from engine if that happened.Good luck.