Did china have any delivery systems other than bombers by 69? I'm pretty sure the soviets would be able to intercept that before any bomber gets to major population center (other than vladivostok, possibly)
Small numbers of Dongfeng 1 (550km range) - basically a copy of the Soviet R-2 - and Dongfeng 2 (1250km range) - a copy of the Soviet R-4/SS-3 Shyster.
Not very useful as strategic weapons - they could hit (say) Novosibirsk or Alma-Ata, but not Chelyabinsk, let alone Moscow.
Against that, the Soviets can deploy nuclear-tipped ABM-1 Galoshes. Of course, most of those sites were in European Russia. I've no idea whether the Soviets redeployed any during this crisis.
For bombers, they had a small number of their versions of IL-28's and Tu-16's. Nothing the Soviets won't be able to sweep out of the skies in short order.
The PRC nuclear force is likely going to have a short exciting life. If they strike first, they might take out a handful of Siberian cities or bases and hit a few ground formations. But even that is a big "if." The Soviets could, by contrast, burn much of China down to bedrock whilst keeping an ample force reserved for the U.S. and NATO.