64 Valiant 273ci noisy valve train

Hi folks. Just purchased a 64 Signet convertible with a very noisy valve train. I'm told they are solid lifters.Does an adjustment usually quiet them or is it more likely to be excessive wear? It only shows about 70.000 miles on it but I suppose it could have rolled over once or more. It still idles quite smoothly and and starts without a hitch. Any info would be appreciated, thanks.