Welcome to the forum. Please add your location and your bike's model and model year to your profile so that you don't have to remember to tell us every time and we don't have to keep asking when you forget (see Forum Settings link in my signature).
And welcome to the world of antique vehicle ownership (they own us, not the other way around). Your bike is about 4 decades old and may or may not have had all of the maintenance necessary to keep it safe & reliable so it is highly recommended to download the Factory Shop Manual for your model (available through the CX Wiki - link in my signature) and go through all of the service procedures, regardless of whether your bike has reached the specified mileage.
I also recommend looking on all rubber parts with suspicion because rubber does not age gracefully. Check the date codes on your tires and replace them if they are over 5 years old no matter how good they look & feel (old rubber simply cannot flow around the irregularities in the asphalt well enough to grip, especially if it is cool or wet). If your bike still has the original rubber brake line(s) (should be replaced every 2 or 3 fluid changes = 5 or 6 years) I recommend shopping for modern stainless braided ones (they last practically forever and double the life of the fluid). And don't forget things like the rad hoses and the boot between the engine and swingarm (they can crack on the bottom where you don't see it).
You may also want to go through that "new" engine because even if it has never been run every rubber part i it is over 40 years old and the bearings have been sitting in the same position for just as long.
I would highly recommend getting in touch with forum member Murrayf (AKA Murray of Murray's Carbs). He has recommissioned several crate engines over the years and can tell you how to tell if that is a genuine crate engine or just a used one that has been cosmetically restored and if it is what is needed if you want it to last. As he said in another thread about a crate engine
do you guys have any idea how much work it is to get a crate engine that has been in a box for 40 plus years ready to run?
you cant just fire it up and go it will kill the bearings that are dried and glued together.
whoever starts that engine better know what they are doing or it will be a paperweight in 500 miles DAMHIK
The best advice anyone can give you about customizing any vehicle is to get it safe & reliable in more or less original condition and use it for a while before you start making any changes so it can tell you what changes it needs to make it do what you want/need better. That approach almost always results in something you actually want to keep and use but making changes based on style or on what someone else (who may or may not really understand how the changes affect the way it works) has done often results in a piece of expensive yard art that you can't stand sitting on for more than a few minutes and might even be dangerous.
