I wouldnt worry about the timing chain with only 46 K on it.. Id be more worried about the Tires/ belts, is the Alt charging, when was the Last time it was driven?? Does the tranny still shift or is it all varnished up?? How old is the fuel in the tank, when was the fuel filter last changed, Stuff like that.

Yes the timing gear is old as well, But that would be very Low on the list of My worries.

Friend bought a 80, something impala/caprice not sure but it only had 34 K on it. but it sat for a Long time, it was a friends dad who passed away. Couldn't pass up the deal, got it home, realized the tranny wouldn't work in reverse very well and sometimes not at All. All the brake lines was rusted out and blew after the first week. Tires were All dry rotted. Calipers All froze up, rotors rusted as well. ETC,ETC

34,000 miles , he thought it would be almost like a new but just older car. Like I said, I wouldn't worry about the Timing chain.