Early 302, I have had stock engines hang valves (I had issues with the head builder). That is the valve opens, sticks in the guide and never closes. Both intake and exhaust clear. So if it is a stock engine, throw a timing set on and go. It is easy to get into look here, replace that, next thing you know you have a half rebuilt engine that is half assed.
All it needs is a timing set, put it in, quit worring about what else is going on in there. Sure it has 140k on it. Yes there will be wear. Why put effort into fixing some wear and ignor the rest. that is a waste of money. Put all the new parts in when you rebuild it, not at 140k. Give it what it needs now and go on with life. There is no reason (other then to fix a leak or part of the diagnosis already done) to even pull the intake or the valve covers. Save your money, leave it alone. When you look you will find wear, that is expected. Is it a problem? Not really! It was running before, unless it had a problem (not related to the timing chain going out) it should be just as good as it was.
Quit worrying about everything, put a timing set on it, drive it.