Broken pushrod dilemma

[Myoldtruck]

Need some input with my engine.
bought 71 gmc with 350 that had work done to it 6 years ago before being left behind farmers house. I have receipts from the machine shop from back in the day.

when i bought the truck it wasnt running. I got it running poorly 2 weeks ago. You could here the pushrods making noise. I pulled intake and valve covers today and found on Number 4 cylinder, broken push rod on intake and completely missing roller rocker arm on the exhaust. It was taken off by someone, rocker, nut and all, just not there at all. That pushrod was in one piece and not bent.

Im thinking at this point to do a bleed down test on that cylinder. Also check to see if lobes for that cylinder on the cam are still good.

Any more input would be appreciated.