My truck sat for 3 years while I did a few months of work on it.
After I got it restarted a valve stuck and I bent a pushrods. Not knowing how to replace the push rod I came on his forum.
I replaced the push rod and have not had any other problems since. I used these instructions
You can get them at FLAPS but measure the one You have and tell that to the salesman when you order it.Or You can order from one of the venders ,the rocker will slide against the spring so You can get it out of the way to get the push rod out ,if you spin the other ones with you're fingers ,turning the engine over to get the pressure of the valve spring off , you'll be able to check to see if there are any other bent ones,as long as you're already working on the valves.
Pete
If you do need to replace your engine as suggested above there is one listed in the parts for sale section of this forum. It's in Texas
https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=814837#Post814837Good luck