Chevy 250 valve train noise

[250isbestmotor]

I have a 1968 Chevy c10 250 inline with turbo 400 trans I got the tuck 2 years ago the truck sat for 15 years it spun freely when I got it and didn’t take much to get running cleaned out carb and a fuel cell to run it for a bit the truck ran okay for around 6 months had no brakes so just running it in the yard and when to crank it one time and it wouldn’t start had spark and was getting gas I pulled rocker cover and found closest cylinder to fire wall the rocker arm had came off and pushrod was bent I removed side cover and flat tappet lifter appeared fine so I put a one new pushrod in set spun the pushrod and set the lash with one halve turn as Chevy service manual states and truck runs pretty good I’ve done lots of work to motor since then but the rocker sounds like it is about to fly off in the back what could be the issue? Incorrect lash? Or is the head smoked? The rocker arm nut when tighten down is not at the same hight as the rest not sure if this matters any info helps. Thanks https://ibb.co/DDpTC09m image link