The '69 block won't have a place to put the knock sensor....since there were no computerized '69 blocks. I have heard that you can buy a freeze plug with the correct hole to install the knock sensor in. I've also heard of guys drilling and tapping the freeze plug they have. I haven't tried it myself. That will be about the only options that you have if you want to use the '69 block and the knock sensor. Good luck with your build.