383 lost oil pressure

Hello,
I previously had a thread going "383 intake gasket and valve cover choice" but new issue so starting this thread. Just finished putting new intake gasket, oil/filter, new valve covers and a different carb. Two rides later lost oil pressure, was able to stop engine - just backed out of driveway hopefully before any other major damage as it just seem to start sounding a little off. Reading forum I pulled one valve cover so far and found #6 cylinder having one bent pushrod and one pushrod that just starting to go thru the rocker arm. Not sure why this happened unless old engine or spirted drive by my son. The motor came with the car but I don't no much about it. He did install a cam but it's basically a stock grind - I do have the paper work. I would like to get this back up and running if possible for a few more months of driving weather. Planning to build another motor this winter. My motor is a 68 383 not sure if I can use any parts from the 73 or 74 400 motor (the one in pics on a tire) assuming I just need a couple of pushrods and rocker arms as I just picked up this motor a few days ago ?

Currently planning on buying an oil prime rod for testing later and a new intake gasket as I assume I will likely need to go in there again. I also have a fiber optic light that can look inside spark plug hole to inspect for any damage.

Looking for advice what others have done to recover. Especially what parts I need to order and from where.

Thanks
Greg

383 bent push rod.jpg

383 rocker.jpg

400 used 73 or 74.jpg